#ULEZ Diesel Car Check

[ulezcheck01]

Understanding ULEZ Vehicle Requirements

"Understanding ULEZ Vehicle Requirements" is an informative guide that delves into the intricacies of London's Ultra Low Emission Zone (ULEZ). This resource provides valuable insights into the criteria and regulations that vehicles must meet to comply with ULEZ standards, helping you navigate eco-friendly urban transportation with ease.

[yournewmotor41]

6 cheap cars for sale in uk under £1500 — Check out the full list here!

Introduction

Purchasing a car can be extremely expensive. There’s the cost of insurance, MOTs, repair, and maintenance if something goes wrong, and the car itself. However, if money gets tight, you don’t have to break the bank to get a good car. Top 6 cheap cars for sale uk under £1500 read below points to buy or sell your car.

So, what should you do in this situation?

Consider getting second hand care.

That appears to be a viable option, doesn’t it?

Do you know? The majority of people are hesitant to buy cheapest used car for sell.

But, believe me, buying a used car is nothing to be worried about, and scouring the used market can reveal some splendid cars at rock-bottom prices. Used cars are alright as long as you know what to look for and can easily meet your needs.

And to help you out, we’ve done our research to help you with the 6 best cheap cars for sale uk under £1500. So, let’s get started!

Here’s a list to buy the top 6 used cars online under £1500

1. Mini Hatchback

This Mini Hatchback is a stunning vehicle that can be purchased for around £2,000–3,500. Whether you get the One model or the significantly more powerful Cooper, these cars are a lot of fun to drive.

While the preliminary price of the car may be comparable, the variation in power will make insurance more pricey for newer car owners, so keep that in mind.

Both the diesel and petrol approaches are ULEZ compliant because of their low emission levels, which aim to minimize long-term expenses. And we think that when it comes to budget cars, none of it outperforms the fun of driving a Mini car like this.

2. Skoda Fabia

The ŠKODA Fabia is yet another wonderful car to consider if you have less than £1500 to spend. It’s a spacious supermini that’s also reasonably priced and well-equipped. It also has 15-inch alloy wheels, air conditioning, and a remote central closing mechanism.

Because of its VW Polo underpinnings and 390-liter boot, its interior feels more posh than some competitors. A £1500 budget will get you a 1.2-litre model that can ride at motorway velocities and return up to 51mpg. It’s easy to drive because it makes very little wind and tyre noise.

3. Ford Focus

We like the Ford Focus, and you should too; it was continuously Britain’s best-selling family second hand electric cars for the majority of its existence. There are many versions from which you can choose the ideal one, and you can’t go wrong with either the petrol or diesel version.

The Focus, like all Fords from this period, is enjoyable to drive, with pointed navigation and tight dealing, as well as excellent fuel economy, particularly in the 1.6-litre diesel and 1.0-litre Eco Boost petrol variants.

Your £1500 cost estimate will get you a decent 2015 Eco Boost model in the most attractive Zetec trim level.

The early serviceability concerns with the EcoBoost engine had been resolved by that spot, but make gets the best version you can find.

4. Toyota Aygo

The Toyota Aygo is intended for young drivers who want a reasonably priced small second hand car from market with low operating costs. The 1.0-litre petrol engine consumes little fuel and has cheaper insurance bands, making this an elegant and value-packed compact car within your £1500 budget.

The interior is well-made, durable, and fashionable. However, there isn’t much leg room in the back seats, which makes tall adults feel a little uncomfortable on long journeys.

The Aygo has a lot to contribute as a small car for a young driver. Its striking exterior is trendy, and its standard features are accommodating, with x-play models receiving five doors, alloy wheels, and a touchpad navigation system.

5. Kia Cee’d

The second-generation Kia Cee’d is a stylish vehicle both inside and out. It is well-constructed and spacious, providing a comfortable experience throughout the journey.

Face lifted in 2015, it represented a significant advancement for the Korean automaker. It compares favourably to its competitors and is a good all-rounder, with more recent models benefiting from the trailing edge of Kia’s generous seven-year/100,000-mile warranty.

The Cee’d comes with a lot of features, and you can choose between a diesel or petrol engine.

Cee’d keep their significance well, so if you’re looking to local used cars for sell less than £1500 this one is a good bet.

6. Honda Jazz

The Honda Jazz is a car that is definitely worth a recommendation under a £1500budget bracket. This one is quite functional, flexible, and comfy, and it has a devoted following among older drivers who appreciate its all-around brilliance.

The ‘magic seat’ system on the Jazz, for example, is novel in that it allows you to bend or turn the rear seats to generate a flat load room or use the area in the footwells.

The engines available are efficient 1.2 and 1.4-litre petrol. Both have good fuel economy, with an advertised fuel economy of 50–54mpg. You can also choose between a manual and an automatic transmission as per your requirements.

To wrap up!

We have listed out the top 6 second hand diesel cars you should consider under the budget bracket of £1500. All these cars are quite sturdy, comfortable, and easy to drive along with better speed and mileage. You can choose the ideal one as per your requirements.

You can chat with different car dealers in workshop and buy the best car as per your needs and preferences. So, what are you waiting for?

However, there are more such cars out there under this specific budget, and if you want to avail this — you can check out the leading platform “Yournewmotor” to browse a variety of used cars.

For more visit : https://www.yournewmotor.co.uk/

[juliestacy]

This is one smart device that every urban home could use Natasha Lomas @riptari / 1 day

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away.

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

Changing bed sheets can also look pretty disturbing…

An evening BBQ on a nearby roof terrace appears much, much worse though:

And opening the balcony door to the street on a busy Saturday afternoon is just… insane…

Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

Original Article

This is one smart device that every urban home could use

This is one smart device that every urban home could use Natasha Lomas @riptari / 1 day …

This is one smart device that every urban home could use This is one smart device that every urban home could use Natasha Lomas @riptari / 1 day …

[morganbelarus]

London prepares for launch of ultra-low emissions zone

Almost 1,000 people a year in London are hospitalised with asthma caused by pollution

London is preparing to enforce world-leading vehicle pollution restrictions from Monday as the capital attempts to clean up the toxic air blamed for thousands of premature deaths.

The ultra-low emission zone, or Ulez, will launch at one minute past midnight, imposing a 12.50-a-day charge to drive into central London in all but the cleanest cars and vans.

The move is expected to reduce road transport emissions by around 45%. The mayor, Sadiq Khan, unveiled research showing that almost 1,000 people a year in the city were hospitalised with asthma caused by pollution.

The charge will be levied inside Londons congestion charge zone around the clock, and motorists driving polluting cars during the daytime will have to pay both charges, meaning it will cost 24 to take such vehicles into central London between 7am and 6pm.

Quick guide

What is the Ulez?

Show Hide

When and where does it operate?

From 8 April 2019, in central Londons congestion charge zone in central London, 24 hours a day, seven days a week. From October 2021 the Ulez will be expanded to inner London boroughs, up to the North and South Circular roads.

Who pays?

Drivers of older cars, vans and motorbikes will have to pay 12.50 a day if they do not meet tighter exhaust emissions standards. Non-compliant lorries and coaches will be charged 100 a day.

Is my car compliant?

If it is a Euro 6 diesel (normally made after 2015) or Euro 4 petrol engine (newer than 2005) it is exempt from the charge. Drivers can check whether their vehicle is complianton the TfL website.

Is this instead of the congestion charge?

No, it is as well as the C-charge, which applies to those who enter the zone from Monday and Friday between 7am to 6pm. That costs 11.50.

How will drivers know and what if I dont pay?

Number-plate recognition cameras will check the cars, whose emission certifications are in the DVLA database. Drivers can pay the charge by midnight the following day. Failure to pay will result in a fine of 160 for cars or 1,000 for lorries.

Will any drivers of older vehicles be exempt?

Disabled badge holders, until 2025, and residents of the current congestion charge zone, until 2021, will be exempt. So will black-cab drivers.

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Thank you for your feedback.

It will apply to drivers of diesel cars and vans whose engines are not certified to the latest Euro 6 standard, mandated from 2015, as well as most petrol cars more than 14 years old. Non-compliant buses, coaches and lorries will have to pay 100.

The charge will be enforced using number-plate recognition and the DVLA database, which includes every vehicles emission standards.

City Hall said the scheme would improve air quality throughout the city by limiting journeys by polluting vehicles and encouraging drivers to switch to cleaner modes of transport.

A bigger improvement but a potential shock to London residents owning the most polluting cars could come in October 2021, when the Ulez is due to be extended to all areas inside the North and South Circular roads. That enlargement will bring around 640,000 vehicles into the zone, around 135,000 of which will be liable for the charge.

Map

Other cities including Birmingham and Leeds have said they will introduce clean air zones in 2020, and Manchester plans to follow suit.

Shirley Rodrigues, Londons deputy mayor for the environment, said air pollution was a social justice issue. The poorest are least likely to own a car but most likely to live in an area of high pollution, she said.

Currently more than 2 million people in London including more than 400,000 children live in areas where the air quality breaks legal limits for nitrogen dioxide.

City Hall forecasts that the measures will bring almost all of London excluding major roads and the area around Heathrow well within European legal air limits by 2025, and that no London primary and secondary schools will be in areas of toxic pollution. At present, air quality breaches legal limits at 451 schools.

A study by Kings College London and Imperial College London found that each day on average four Londoners, including one child under 14, were hospitalised for breathing difficulties owing to air pollution. Researchers estimated that around one in 10 of London childrens asthma admissions were directly due to air quality.

Khan said: As someone who developed adult-onset asthma over the last few years, I know from personal experience that Londons toxic air is damaging peoples health.

Dr Penny Woods, the chief executive of the British Lung Foundation, said the figures were not surprising, and toxic air put everyone at risk of lung cancer and respiratory disease. Its the biggest environmental threat to human health, yet because its invisible its often ignored, she said.

The launch of the Ulez has been widely welcomed by both business and environmental groups, although some urged London and the government to go further and faster by promoting zero-emission vehicles or car-sharing schemes. Independent testing of Euro 6 diesel vehicles has shown that many models continue to breach emissions targets.

The CBI said it was a positive step, but smaller firms could struggle with the charge. The Road Haulage Association however branded the scheme simplistic and anti-motorist, and said some operators would stop servicing the capital.

A 23m scrappage scheme to help small businesses and charities operating older vans and minibuses to upgrade their vehicles was launched only in February. Alex Williams, Transport for Londons director of city planning, said there could be leeway for charities attempting to comply.

Fines will be issued from launch day for drivers who fail to pay the charge. TfL said 90% of London drivers were aware of the scheme, after a publicity blitz including direct mailouts, and 3.2 million people had used its vehicle checker.

Williams said the Ulez was not intended to raise revenue for TfL, whose budget has been savaged by the ending of government grants, delays to Crossrail and stalling passenger figures.

Around 100,000 vehicles enter the zone daily, and Williams said that with increasing numbers of motorists switching to cleaner engines, four in five would be compliant and not liable to the charge. Disabled badge holders will be have a sunset period under which they will be exempt until 26 October 2025, if they fall within the disabled or disabled passenger vehicles tax class.

TfL predicts the charge will cut traffic by 5% in central London. Drivers of Uber and other private hire cars, whose numbers in London have swelled by thousands in recent years, will be liable to pay the charge, but black cabs will remain a notable exception. Most of the 23,000 current licensed vehicles run on diesel, but all new taxis must be zero-emission-capable petrol-electric hybrids.

Original Article : HERE ; This post was curated & posted using : RealSpecific

London prepares for launch of ultra-low emissions zone was originally posted by MetNews

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Reality Check: What should owners of old diesels do?

Image copyright Getty Images

The government’s clean air strategy, which was published on Monday, describes reducing pollution from nitrogen oxides (NOx) as its most immediate challenge.

NOx emissions come mainly from diesel vehicles. Much of the strategy on road transport had been announced previously, including the pledge from July to stop all sales of new conventional petrol or diesel powered cars and vans by 2040.

But it devolves responsibility for reducing NOx emissions mainly to a local level, mentioning measures planned by the mayor of London.

On 8 April this year, London’s Ultra Low Emission Zone (ULEZ) will come into force, requiring some motorists to pay £12.50 a day to drive into the existing congestion charging zone, on top of the current £11.50 charge.

Image copyright Getty Images

The charge will apply to drivers of petrol cars that do not meet the Euro 4 emission standards only, which generally means cars registered before 2005. But diesel owners will have to pay if their cars do not meet the Euro 6 standard, which generally means anything registered before September 2015. You can check whether your car will be affected here.

In October 2021, the ULEZ will expand to cover all roads inside the North Circular and South Circular.

BBC Reality Check examined whether diesel cars were more harmful than petrol ones last year.

While many owners feel they were encouraged to buy diesel cars because of their lower CO2 emissions, they are now being discouraged because of their emissions of oxides of nitrogen.

Registrations of new diesel cars fell 30% last year, according to the Society of Motor Manufacturers and Traders (SMMT).

Overall, registrations were down 7% from 2017 levels.

It means that 32% of new cars registered in 2018 were diesel-powered, down from about 50% five years ago.

If you are an owner of an older diesel, what can you do?

Some of the action against diesel vehicles was taken after it emerged, in 2015, that software used to cheat emissions tests had been built into millions of Volkswagen diesel cars.

VW has made modifications to affected vehicles in the UK but has not offered any compensation. Various class-action lawsuits are under way, claiming that the performance and resale value has been affected.

The government considered funding a scrappage scheme to encourage owners to replace older, more polluting cars with new ones. It might have been similar to the one introduced in the 2009 Budget, which offered owners of cars more than 10 years old £2,000 towards a new car if they scrapped their old one and which finished at the end of March 2010.

Image copyright Getty Images

But in the end, the government decided not to bring in a national scrappage scheme.

It does currently have a subsidy scheme for plug-in electric cars, which covers up to one-third of the purchase price to a maximum of £3,500, but it does not require old vehicles to be scrapped.

Several car manufacturers run their own scrappage schemes, offering customers money off new vehicles if they trade-in old ones.

Some of them will accept only diesel vehicles, although some will also accept petrol cars. It tends to depend on the age of the car, its emissions, how long you have owned it and which new car you are planning to buy.

Better news for owners of diesel-powered cars is that they have held up much better in the second-hand market.

Sales have continued strongly since 2015, according to figures from the SMMT.

“Generally, used-car buyers are far less concerned with issues surrounding diesel than their new-car counterparts,” said Derren Martin, head of UK valuations at cap hpi.

“The fuel economy and torque that diesel continues to offer, alongside the lower [vehicle excise duty] for cars registered before 1 April 2017, means that they continue to be an attractive proposition for many.”

The chart above shows how second hand prices have changed. For example, a three-year-old diesel car – that’s one with a 2016 registration plate – sells for more than a similar three-year-old diesel car did a year ago.

The increasing prices for second hand diesel cars since last summer is quite unusual. Cap hpi, an automotive data provider, expects depreciation of between about 3% and 5% in this figure.

And while it has been a very strong year for all used-car prices, it now expects prices to return to that sort of depreciation.

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This is one smart device that every urban home could use

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

  Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

[gallery ids="1832416,1832420,1832418,1832422,1832423"]

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

  Changing bed sheets can also look pretty disturbing…   

  An evening BBQ on a nearby roof terrace appears much, much worse though:

  And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

  Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

  It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

  For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

from TechCrunch https://tcrn.ch/2Qp0rDG via IFTTT from Blogger http://bit.ly/2W4F6pm via IFTTT

[sheminecrafts]

This is one smart device that every urban home could use

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

  Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

[gallery ids="1832416,1832420,1832418,1832422,1832423"]

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

  Changing bed sheets can also look pretty disturbing…   

  An evening BBQ on a nearby roof terrace appears much, much worse though:

  And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

  Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

  It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

  For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

from iraidajzsmmwtv https://tcrn.ch/2Qp0rDG via IFTTT

[releasesoon]

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food �� or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

  Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

  Changing bed sheets can also look pretty disturbing…   

  An evening BBQ on a nearby roof terrace appears much, much worse though:

  And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

  Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

  It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

  For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

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This is one smart device that every urban home could use Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

[endenogatai]

This is one smart device that every urban home could use

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

  Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

[gallery ids="1832416,1832420,1832418,1832422,1832423"]

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

  Changing bed sheets can also look pretty disturbing…   

  An evening BBQ on a nearby roof terrace appears much, much worse though:

  And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

  Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

  It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

  For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

from RSSMix.com Mix ID 8204425 https://tcrn.ch/2Qp0rDG via IFTTT

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Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

  Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

  Changing bed sheets can also look pretty disturbing…   

  An evening BBQ on a nearby roof terrace appears much, much worse though:

  And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

  Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

  It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

  For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

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This is one smart device that every urban home could use – TechCrunch Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

[managermint]

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

Changing bed sheets can also look pretty disturbing…   

An evening BBQ on a nearby roof terrace appears much, much worse though:

And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

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TechCrunch: This is one smart device that every urban home could use Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

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Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

  Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

  Changing bed sheets can also look pretty disturbing…   

  An evening BBQ on a nearby roof terrace appears much, much worse though:

  And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

  Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

  It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

  For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

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This is one smart device that every urban home could use – TechCrunch Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

[nayanasri]

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

  Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

  Changing bed sheets can also look pretty disturbing…   

  An evening BBQ on a nearby roof terrace appears much, much worse though:

  And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

  Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

  It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

  For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

Gadgets – TechCrunch

This is one smart device that every urban home could use Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

[dizzedcom]

Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

But the biggest problem afflicting city dwellers is not some minor inconvenience. It’s bad, poor, terrible, horrible, unhealthy air. And there’s no app to fix that.

Nor can hardware solve this problem. But smart hardware can at least help.

For about a month I’ve been road-testing a wi-fi connected air purifier made by Swedish company, Blueair. It uses an Hepa filtration system combined with integrated air quality sensors to provide real-time in-app feedback which can be reassuring or alert you to unseen problems.

Flip to the bottom of this article for a speed take or continue reading for the full review of the Blueair Classic 480i with dual filters to reduce dust, smoke and pollen   

Review

If you’re even vaguely environmentally aware it’s fascinating and not a little horrifying to see how variable the air quality is inside your home. Everyday stuff like cooking, cleaning and changing the sheets can cause drastic swings in PM 2.5 and tVOC levels. Aka very small particles such as fine dust, smoke, odours and mite feces; and total volatile organic compounds, which refers to hundreds of different gases emitted by certain solids and liquids — including stuff humans breathe out by also harmful VOCs like formaldehyde.

What you learn from smart hardware can be not just informative but instructive. For instance I’ve switched to a less dusty cat litter after seeing how quickly the machine’s fan stepped up a gear after clearing the litter tray. I also have a new depth of understanding of quite how much pollution finds its way into my apartment when the upstairs neighbour is having a rooftop BBQ. Which makes it doubly offensive I wasn’t invited.

Though, I must admit, I’ve yet to figure out a diplomatic way to convince him to rethink his regular cook-out sessions. Again, some problems can’t be fixed by apps. Meanwhile city life means we’re all, to a greater or lesser degree, adding to the collectively polluted atmosphere. Changing that requires new politics.

You cannot hermetically seal your home against outdoor air pollution. It wouldn’t make for a healthy environment either. Indoor spaces must be properly ventilated. Adequate ventilation is also of course necessary to control moisture levels to prevent other nasty issues like mould. And using this device I’ve watched as opening a window almost instantly reduced tVOC levels.

Pretty much every city resident is affected by air pollution, to some degree. And it’s a heck of a lot harder to switch your home than change your brand of cat litter. But even on that far less fixable front, having an air quality sensor indoors can be really useful — to help you figure out the best (and worst) times to air out the house. I certainly won’t be opening the balcony doors on a busy Saturday afternoon any time soon, for example.

Blueair sells a range of air purifiers. The model I’ve been testing, the Blueair Classic 480i, is large enough to filter a room of up to 40m2. It includes filters capable of filtering both particulate matter and traffic fumes (aka its “SmokeStop” filter). The latter was important for me, given I live near a pretty busy road. But the model can be bought with just a particle filter if you prefer. The dual filtration model I’m testing is priced at €725 for EU buyers.

Point number one is that if you’re serious about improving indoor air quality the size of an air purifier really does matter. You need a device with a fan that’s powerful enough to cycle all the air in the room in a reasonable timeframe. (Blueair promises five air changes per hour for this model, per the correct room size).

So while smaller air filter devices might look cute, if a desktop is all the space you can stretch to you’d probably be better off getting a few pot plants.

Blueair’s hardware also has software in the mix too, of course. The companion Blueair Friend app serves up the real-time feedback on both indoor air quality and out. The latter via a third party service whose provider can vary depending on your location. Where I live in Europe it’s powered by BreezoMeter.

This is a handy addition for getting the bigger picture. If you find you have stubbornly bad air quality levels indoors and really can’t figure out why, most often a quick tab switch will confirm local pollution levels are indeed awful right now. It’s likely not just you but the whole neighbourhood suffering.

Dirty cities 

From Asia to America the burning of fossil fuels has consequences for air quality and health that are usually especially pronounced in dense urban environments where humans increasingly live. More than half the world’s population now lives in urban areas — with the UN predicting this will grow to around 70% by 2050.

In Europe, this is already true for more than 70% of the population which makes air pollution a major concern in many regional cities.

Growing awareness of the problem is beginning to lead to policy interventions — such as London’s ultra low emission charging zone and car free Sundays one day a month in Paris’ city center. But EU citizens are still, all too often, stuck sucking in unhealthy air.

London’s toxic air is an invisible killer.

We launched the world’s first Ultra Low Emission Zone to cut air pollution. Since then, there have been on average 9400 fewer polluting vehicles on our streets every day. #LetLondonBreathe #ULEZ pic.twitter.com/0mYcIGi1xP

— Mayor of London (@MayorofLondon) May 23, 2019

  Last year six EU nations, including the UK, France and Germany, were referred to the highest court in Europe for failing to tackle air pollution — including illegally high levels of nitrogen dioxide produced by diesel-powered vehicles.

Around one in eight EU citizens who live in an urban area is exposed to air pollutant levels that exceed one or more of the region’s air quality standards, according to a briefing note published by the European Environment Agency (EEA) last year.

It also said up to 96% of EU urban citizens are exposed to levels of one or more air pollutants deemed damaging to health when measured against the World Health Organization’s more stringent guidelines.

There are multiple and sometimes interlinked factors impacting air quality in urban environments. Traffic fumes is a very big one. But changes in meteorological conditions due to climate change are also expected to increase certain concentrations of air pollutants. While emissions from wildfires is another problem exacerbated by drought conditions which are linked to climate change that can also degrade air quality in nearby cities.

Action to tackle climate change continues to lag far behind what’s needed to put a check on global warming. Even as far too little is still being done in most urban regions to reduce vehicular emissions at a local level.

In short, this problem isn’t going away anytime soon — and all too often air quality is still getting worse.

At the same time health risks from air pollution are omnipresent and can be especially dangerous for children. A landmark global study of the impact of traffic fumes on childhood asthma, published recently in the Lancet, estimates that four million children develop the condition every year primarily as a result of nitrogen dioxide air pollution emitted by vehicles.

The majority (64%) of these new cases were found to occur in urban centres — increasing to 90% when factoring in surrounding suburban areas.

The study also found that damage caused by air pollution is not limited to the most highly polluted cities in China and India. “Many high-income countries have high NO2 exposures, especially those in North America, western Europe, and Asia Pacific,” it notes.

The long and short of all this is that cities the world over are going to need to get radically great at managing air quality — especially traffic emissions — and fast. But, in the meanwhile, city dwellers who can’t or don’t want to quit the bright lights are stuck breathing dirty air. So it’s easy to imagine consumer demand growing for in-home devices that can sense and filter pollutants as urbanities try to find ways to balance living in a city with reducing their exposure to the bad stuff.

Cleaner air

That’s not to say that any commercial air purifier will be able to provide a complete fix. The overarching problem of air pollution is far too big and bad for that. A true fix would demand radical policy interventions, such as removing all polluting vehicles from urban living spaces. (And there’s precious little sign of anything so radical on the horizon.)

But at least at an individual home level, a large air purifier with decent filtration technology should reduce your exposure to pollution in the place you likely spend the most time.

If, as the Blueair Classic 480i model does, the filtration device also includes embedded sensors to give real-time feedback on air quality it can further help you manage pollution risk — by providing data so you can better understand the risks in and around your home and make better decisions about, for instance, when to open a window.

“Air quality does always change,” admits Blueair’s chief product officer, Jonas Holst, when we chat. “We cannot promise to our consumers that you will always have super, super, clean air. But we can promise to consumers that you will always have a lot cleaner air by having our product — because it depends on what happens around you. In the outdoor, by your neighbours, if you’re cooking, what your cat does or something. All of those things impact air quality.

“But by having high speeds, thanks to the HepaSilent technology that we use, we can make sure that we always constantly fight that bombardment of pollutants.”

On the technology front, Blueair is using established filtration technology — Hepa and active carbon filters to remove particular matter and gaseous pollutants — but with an ionizing twist (which it brands ‘HepaSilent’).

This involves applying mechanical and electrostatic filtration in combination to enhance performance of the air purifier without boosting noise levels or requiring large amounts of energy to run. Holst dubs it one of the “core strengths” of the Blueair product line.

“Mechanical filtration just means a filter [plus a fan to draw the air through it]. We have a filter but by using the ionization chamber we have inside the product we can boost the performance of the filter without making it very, very dense. And by doing that we can let more air through the product and simply then clean more air faster,” he explains.

“It’s also something that is constantly being developed,” he adds of the firm’s Hepa + ionizing technology, which it’s been developing in its products for some 20 years. “We have had many developments of this technology since but the base technical structure is there in the combination between a mechanical and electrostatical filtration. That is what allows us to have less noise and less energy because the fan doesn’t work as hard.”

On top of that, in the model I’m testing, Blueair has embedded air quality sensors — which connect via wi-fi to the companion app where the curious user can see real-time plots of things like PM 2.5 and tVOC levels, and start to join the dots between what’s going on in their home and what the machine is sniffing out.

The sensors mean the unit can step up and down the fan speed and filtration level automatically in response to pollution spikes (you can choose it to trigger on particulate matter only, or PM 2.5 and tVOC gaseous compounds, or turn automation off altogether). So if you’re really not at all curious that’s okay too. You can just plug it in, hook it to the wi-fi and let it work.

Sound, energy and sensing smarts in a big package

To give a ballpark of energy consumption for this model, Holst says the Blueair Classic 480i consumes “approximately” the same amount of energy as running a lightbulb — assuming it’s running mostly on lower fan speeds.

As and when the fan steps up in response to a spike in levels of potential pollutants he admits it will consume “a little bit more” energy.

The official specs list the model’s energy consumption at between 15-90 watts.

On the noise front it’s extremely quiet when on the lowest fan setting. To the point of being barely noticeable. You can sleep in the same room and certainly won’t be kept awake.

You will notice when the fan switches up to the second or, especially, the third (max) speed — where it can hit 52 dB(A)). The latter’s rushing air sounds are discernible from a distance, even in another room. But you hopefully won’t be stuck listening to level 3 fan noise for too long, unless you live in a really polluted place. Or, well, unless you run into an algorithmic malfunction (more on that below).

As noted earlier, the unit’s smart sensing capabilities mean fan speed can be set to automatically adjust in response to changing pollution levels — which is obviously the most useful mode to use since you won’t need to keep checking in to see whether or not the air is clean.

You can manually override the automation and fix/switch the fan at a speed of your choice via the app. And as I found there are scenarios where an override is essential. Which we’ll get to shortly.

The unit I was testing, a model that’s around two years old, arrived with instructions to let it run for a week without unplugging so that the machine learning algorithms could configure to local conditions and offer a more accurate read on gases and particles. Holst told us that the U.S. version of the 480i is  “slightly updated” — and, as such, this learning process has been eliminated. So you should be able to just plug it in and get the most accurate reads right away. 

The company recommends changing the filters every six months to “ensure performance”, or more if you live in a very polluted area. The companion app tracks days (estimated) remaining running time in the form of a days left countdown.

Looks wise, there’s no getting around the Blueair Classic 480i is a big device. Think ‘bedside table’ big.

You’re not going to miss it in your room and it does need a bigger footprint of free space around it so as not to block the air intake and outlet. Something in the region of ~80x60cm. Its lozenge shape helps by ensuring no awkward corners and with finding somewhere it can be parked parallel but not too close to a wall.

There’s not much more to say about the design of this particular model except that it’s thoughtful. The unit has a minimalist look which avoids coming across too much like a piece of ugly office furniture. While its white and gun metal grey hues plus curved flanks help it blend into the background. I haven’t found it to be an eyesore.

A neat flip up lid hides a set of basic physical controls. But once you’ve done the wi-fi set-up and linked it to the companion app you may never need to use these buttons as everything can be controlled in the app.

Real-time pollution levels at your fingertips

Warning: This app can be addictive! For weeks after installing the unit it was almost impossible to resist constantly checking the pollution levels. Mostly because it was fascinating to watch how domestic activity could send one or other level spiking or falling.

As well as PM 2.5 and tVOC pollutants this model tracks temperature and humidity levels. It offers day, week and monthly plots for everything it tracks.

The day view is definitely the most addictive — as it’s where you see instant changes and can try to understand what’s triggering what. So you can literally join the dots between, for example, hearing a street sweeper below your window and watching a rise in PM 2.5 levels in the app right after. Erk!

Though don’t expect a more detailed breakdown of the two pollutant categories; it’s an aggregated mix in both cases. (And some of the gases that make up the tVOC mix aren’t harmful.)

The month tab gives a longer overview which can be handy to spot regular pollution patterns (though the view is a little cramped on less phablet-y smartphone screens).

While week view offers a more recent snapshot if you’re trying to get a sense of your average pollution exposure over a shorter time frame.

That was one feature I thought the app could have calculated for you. But, equally, more granular quantification might risk over-egging the pudding. It would also risk being mislead if the sensor accuracy fails on you. The overarching problem with pollution exposure is that, sadly, there’s only so much an individual can do to reduce it. So it probably makes sense not to calculate your pollution exposure score.

The app could certainly provide more detail than it does but Holst told us the aim is to offer enough info to people who are interested without it being overwhelming. He also said many customers just want to plug it in and let it work, not be checking out daily charts. (Though if you’re geeky you will of course want the data.)

It’s clear there is lots of simplification going, as you’d expect with this being a consumer device, not a scientific instrument. I found the Blueair app satisfied my surface curiosity while seeing ways its utility could be extended with more features. But in the end I get that it’s designed to be an air-suck, not a time-suck, so I do think they’ve got the balance there pretty much right.

There are enough real-time signals to be able to link specific activities/events with changes in air quality. So you can literally watch as the tVOC level drops when you open a window. (Or rises if your neighbor is BBQing… ). And I very quickly learnt that opening a window will (usually) lower tVOC but send PM 2.5 rising — at least where I live in a dusty, polluted city. So, again, cleaner air is all you should expect.

Using the app you can try and figure out, for instance, optimal ventilation timings. I also found having the real-time info gave me a new appreciation for heavy rain — which seemed to be really great for clearing dust out of the air, frequently translating into “excellent” levels of PM 2.5 in the app for a while after.

Here are a few examples of how the sensors reacted to different events — and what the reaction suggests…

Cleaning products can temporarily spike tVOC levels:

  Changing bed sheets can also look pretty disturbing…   

  An evening BBQ on a nearby roof terrace appears much, much worse though:

  And opening the balcony door to the street on a busy Saturday afternoon is just… insane… 

  Uh-oh, algorithm malfunction…

After a few minutes of leaving the balcony door open one fateful Saturday afternoon, which almost instantly sent the unit into max fan speed overdrive, I was surprised to find the fan still blasting away an hour later, and then three hours later, and at bedtime, and in the morning. By which point I thought something really didn’t seem right.

The read from the app showed the pollution level had dropped down from the very high spike but it was still being rated as ‘polluted’ — a level which keeps the fan at the top speed. So I started to suspect something had misfired.

This is where being able to switch to manual is essential — meaning I could override the algorithm’s conviction that the air was really bad and dial the fan down to a lower setting.

That override provided a temporary ‘fix’ but the unnaturally elevated ‘pollution’ read continued for the best part of a week. This made it look like the whole sensing capacity had broken. And without the ability to automatically adapt to changing pollution levels the smart air purifier was now suddenly dumb…

  It turned out Blueair has a fix for this sort of algorithmic malfunction. Though it’s not quick.

After explaining the issue to the company, laying out my suspicion that the sensors weren’t reading correctly, it told me the algorithms are programmed to respond to this type of situation by reseting around seven days after the event, assuming the read accuracy hasn’t already corrected itself by then.

Sure enough, almost a week later that’s exactly what happened. Though I couldn’t find anything to explain this might happen in the user manual, so it would be helpful if they include it in a troubleshooting section.

Here’s the month view showing the crazy PM 2.5 spike; the elevated extended (false) reading; then the correction; followed finally by (relatively) normal service…

  For a while after this incident the algorithms also seemed overly sensitive — and I had to step in again several times to override the top gear setting as its read on pollution levels was back into the yellow without an obvious reason why.

When the level reads ‘polluted’ it automatically triggers the highest fan speed. Paradoxically, this sometimes seems to have the self-defeating effect of appearing to draw dust up into the air — thereby keeping the PM 2.5 level elevated. So at times manually lowering the fan when it’s only slightly polluted can reduce pollution levels quicker than just letting it blast away. Which is one product niggle.

When viewed in the app the sustained elevated pollution level did look pretty obviously wrong — to the human brain at least. So, like every ‘smart’ device, this one also benefits from having human logic involved to complete the loop.

Concluding thoughts after a month’s use

A few weeks on from the first algorithm malfunction the unit’s sensing capacity at first appeared to have stabilized — in that it was back to the not-so-hair-trigger-sensitivity that had been the case prior to balcony-door-gate.

For a while it seemed less prone to have a sustained freak out over relatively minor domestic activities like lifting clean sheets out of the cupboard, as if it had clicked into a smoother operating grove. Though I remained wary of trying the full bore Saturday balcony door.

I thought this period of relative tranquility might signal improved measurement accuracy, the learning algos having been through not just an initial training cycle but a major malfunction plus correction. Though of course there was no way to be sure.

It’s possible there had also been a genuine improvement in indoor air quality — i.e. as a consequence of, for example, better ventilation habits and avoiding key pollution triggers because I now have real-time air quality feedback to act on so can be smarter about when to open windows, where to shake sheets, which type of cat litter to buy and so on.

It’s a reassuring idea. Though one that requires putting your faith in algorithms that are demonstrably far from perfect. Even when they’re functioning they’re a simplification and approximation of what’s really going on. And when they fail, well, they are clearly getting it totally wrong.

Almost bang on the month mark of testing there was suddenly another crazy high PM 2.5 spike.

One rainy afternoon the read surged from ‘good’ to ‘highly polluted’ without any real explanation. I had opened a patio on the other side of the apartment but it does not open onto a street. This time the reading stuck at 400 even with the fan going full blast. So it looked like an even more major algorithm crash…

Really clean air is impossible to mistake. Take a walk in the mountains far from civilization and your lungs will thank you. But cleaner air is harder for humans to quantify. Yet, increasingly, we do need to know how clean or otherwise the stuff we’re breathing is, as more of us are packed into cities exposed to each others’ fumes — and because the harmful health impacts of pollution are increasingly clear.

Without radical policy interventions we’re fast accelerating towards a place where we could be forced to trust sensing algorithms to tell us whether what we’re breathing is harmful or not.

Machines whose algorithms are fallible and might be making rough guestimates, and/or prone to sensing malfunctions. And machines that also won’t be able to promise to make the air entirely safe to breathe. Frankly it’s pretty scary to contemplate.

So while I can’t now imagine doing without some form of in-home air purifier to help manage my urban pollution risk — I’d definitely prefer that this kind of smart hardware wasn’t necessary at all.

In Blueair’s case, the company clearly still has work to do to improve the robustness of its sensing algorithms. Operating conditions for this sort of product will obviously vary widely, so there’s loads of parameters for its algorithms to balance.

With all that stuff to juggle it just seems a bit too easy for the sensing function to spin out of control.

10-second take

The good

Easy to set up, thoughtful product design, including relatively clear in-app controls and content which lets you understand pollution triggers to manage risk. Embedded air quality sensors greatly extend the product’s utility by enabling autonomous response to changes in pollution levels. Quiet operation during regular conditions. Choice of automated or manual fan speed settings. Filtration is powerful and since using the device indoor air quality does seem cleaner.

The bad

Sensing accuracy is not always reliable. The algorithms appear prone to being confused by air pressure changes indoors, such as a large window being opened which can trigger unbelievably high pollution readings that lead to an extended period of inaccurate readings when you can’t rely on the automation to work at all. I also found the feedback in the app can sometimes lag. App content/features are on the minimalist side so you may want more detail. When the pollution level is marginal an elevated fan speed can sometimes appear to challenge the efficacy of the filtration as if it’s holding pollution levels in place rather than reducing them.

Bottom line

If you’re looking for a smart air purifier the Blueair Classic 480i does have a lot to recommend it. Quiet operation, ease of use and a tangible improvement in air quality, thanks to powerful filtration. However the accuracy of the sensing algorithms does pose a dilemma. For me this problem has recurred twice in a month. That’s clearly not ideal when it takes a full week to reset. If it were not for this reliability issue I would not hesitate to recommend the product, as — when not going crazy — the real-time feedback it provides really helps you manage a variety of pollution risks in and around your home. Hopefully the company will work on improving the stability of the algorithms. Or at least offer an option in the app so you can manually reset it if/when it does go wrong.

This is one smart device that every urban home could use Living in a dense urban environment brings many startup-fuelled conveniences, be it near instant delivery of food — or pretty much whatever else you fancy — to a whole range of wheels that can be hopped on (or into) to whisk you around at the tap of an app.

[playareasurfacetypes]

Our response to the expanded London Ultra Low Emission Zone consultation

30 November 2017 ,

All Londoners should benefit from cleaner air: our response to Ultra Low Emission Zone announcement.

The Mayor of London has proposed expansion of the Ultra Low Emission Zone (ULEZ) to the North and South Circular roads for all vehicles from 25 October 2021 From 26 October 2020, ULEZ standards would then apply across Greater London for buses, coaches and lorries only Consultation seeks the public’s views on these actions to lower toxic pollutant emissions Sustrans joins calls for a Londonwide Ultra Low Emission Zone for all vehicles alongside major push for walking and cycling, so that all Londoners can breathe clean air

The Mayor of London today launched a new public consultation on the next phase of his plans to tackle London’s toxic air, reduce filthy emissions and protect the public from harmful pollution by expanding the Ultra-Low Emission Zone (ULEZ). Under a proposal which is out for consultation today, the ULEZ standards would be applied over the breadth of Greater London (Londonwide) for buses, coaches and lorries from 26 October 2020 and for all vehicles (with limited exemptions) up to the north and south circular roads from 25 October 2021.

The proposals are part of the Mayor’s wider plans to help thousands more Londoners breathe cleaner air, protect public health and reduce car emissions from older more polluting vehicles.

The Mayor recently delivered the first phase of these plans by introducing the new Toxicity Charge in central London for the oldest vehicles on top of the Congestion Charge.

From 08 April 2019, the ULEZ will replace the T-Charge and operate in the same Congestion Charge area alongside the congestion charge but will operate 24 hours a day, seven days a week, 365 days a year. The daily charge for non-compliant vehicles will increase from £10 to £12.50 (for cars, vans and motorbikes) and £100 (for buses, coaches and lorries).

The consultation launched today is for the third phase that will deliver the health benefits of ULEZ to thousands more Londoners by extending the Ultra Low Emission Zone in 2021. This could affect 100,000 cars a day, 35,000 vans a day and 3,000 lorries a day.

Matt Winfield, London Director for Sustrans, said: “The Mayor’s proposals to expand the Ultra Low Emission Zone to the North and South Circular have our full support and we want to see the zone expand to cover all vehicles over the whole of Greater London in 2020 so that from Croydon to Romford all Londoners benefit from cleaner air alongside moves to clear the city of diesel entirely.

“Beyond these measures, the evidence shows that to tackle toxic particulate pollution we need fewer vehicles not just cleaner engines, that’s why the Mayor and Boroughs must press on with a comprehensive network of high-quality cycling routes reaching across London and use every available tool to reduce the dominance of traffic on our streets.”

Rachel White, Sustrans' Senior Policy and Political Advisor, added: “The Mayor of London is showing welcome leadership on tackling toxic air pollution with proposals to expand the ULEZ across more of London and record spending on cycling. While the Scottish Government plans to introduce low emission zones in four cities by 2020 and has doubled its active travel budget; the UK Government’s Air Quality Plan lags way behind and will do little to address the problem at its source.”

The World Health Organisation state that there is no safe level for the smallest Particulate Matter (PM2.5) pollution, a major source of which is from the erosion of tyres and brake pads. The Mayor has already strengthened the ULEZ standards to include a particulate matter standard after recent health data revealed that every part of London exceeds recommended World Health Organisation air quality guidelines for PM2.5. The Mayor’s draft London Environment Strategy plans to meet these guidelines by 2030.

Other action from the Mayor includes cleaning up the bus fleet, creating 12 Low Emission Bus Zones, phasing out diesel taxis, funding 50 schools air quality audits, setting tighter standards for construction machinery and introducing air quality alerts. He has also created a Cleaner Vehicle Checker so Londoners can check the real-world emissions of cars and vans before buying them.

The benefits of the expanded ULEZ are reported to include:

Approximately 100,000 people will no longer live in areas exceeding legal limits, which is a reduction of nearly 80 per cent in 2021. 

43 per cent fewer roads exceeding limit values in 2020 and 64 per cent fewer in 2021

71 per cent reduction in schools in areas of exceedance in 2021 – rapidly lowering harmful emissions than can reduce lung development in children

In outer London there would be around a 20 per cent reduction in NOx road transport emissions, and in inner London there would be around a 30 per cent reduction in NOx road transport emissions in 2021

Sustrans is a partner of the Healthy Air Campaign along with 17 other health and environmental organistaions. In December 2016 Sustrans signed an open letter with 10 other organisations to the Mayor of London, Sadiq Khan, asking him to ban diesel cars by no later than 2025, to tackle air pollution in London.

Find out more about the Healthy Air Campaign Read our comment in the Guardian  from RSSMix.com Mix ID 8239593 https://www.sustrans.org.uk/news/our-response-expanded-london-ultra-low-emission-zone-consultation via IFTTT

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Our response to the expanded London Ultra Low Emission Zone consultation

30 November 2017 , ,

All Londoners should benefit from cleaner air: our response to Ultra Low Emission Zone announcement.

The Mayor of London has proposed expansion of the Ultra Low Emission Zone (ULEZ) to the North and South Circular roads for all vehicles from 25 October 2021 From 26 October 2020, ULEZ standards would then apply across Greater London for buses, coaches and lorries only Consultation seeks the public’s views on these actions to lower toxic pollutant emissions Sustrans joins calls for a Londonwide Ultra Low Emission Zone for all vehicles alongside major push for walking and cycling, so that all Londoners can breathe clean air

The Mayor of London today launched a new public consultation on the next phase of his plans to tackle London’s toxic air, reduce filthy emissions and protect the public from harmful pollution by expanding the Ultra-Low Emission Zone (ULEZ). Under a proposal which is out for consultation today, the ULEZ standards would be applied over the breadth of Greater London (Londonwide) for buses, coaches and lorries from 26 October 2020 and for all vehicles (with limited exemptions) up to the north and south circular roads from 25 October 2021.

The proposals are part of the Mayor’s wider plans to help thousands more Londoners breathe cleaner air, protect public health and reduce car emissions from older more polluting vehicles.

The Mayor recently delivered the first phase of these plans by introducing the new Toxicity Charge in central London for the oldest vehicles on top of the Congestion Charge.

From 08 April 2019, the ULEZ will replace the T-Charge and operate in the same Congestion Charge area alongside the congestion charge but will operate 24 hours a day, seven days a week, 365 days a year. The daily charge for non-compliant vehicles will increase from £10 to £12.50 (for cars, vans and motorbikes) and £100 (for buses, coaches and lorries).

The consultation launched today is for the third phase that will deliver the health benefits of ULEZ to thousands more Londoners by extending the Ultra Low Emission Zone in 2021. This could affect 100,000 cars a day, 35,000 vans a day and 3,000 lorries a day.

Matt Winfield, London Director for Sustrans, said: “The Mayor’s proposals to expand the Ultra Low Emission Zone to the North and South Circular have our full support and we want to see the zone expand to cover all vehicles over the whole of Greater London in 2020 so that from Croydon to Romford all Londoners benefit from cleaner air alongside moves to clear the city of diesel entirely.

“Beyond these measures, the evidence shows that to tackle toxic particulate pollution we need fewer vehicles not just cleaner engines, that’s why the Mayor and Boroughs must press on with a comprehensive network of high-quality cycling routes reaching across London and use every available tool to reduce the dominance of traffic on our streets.”

Rachel White, Sustrans' Senior Policy and Political Advisor, added: “The Mayor of London is showing welcome leadership on tackling toxic air pollution with proposals to expand the ULEZ across more of London and record spending on cycling. While the Scottish Government plans to introduce low emission zones in four cities by 2020 and has doubled its active travel budget; the UK Government’s Air Quality Plan lags way behind and will do little to address the problem at its source.”

The World Health Organisation state that there is no safe level for the smallest Particulate Matter (PM2.5) pollution, a major source of which is from the erosion of tyres and brake pads. The Mayor has already strengthened the ULEZ standards to include a particulate matter standard after recent health data revealed that every part of London exceeds recommended World Health Organisation air quality guidelines for PM2.5. The Mayor’s draft London Environment Strategy plans to meet these guidelines by 2030.

Other action from the Mayor includes cleaning up the bus fleet, creating 12 Low Emission Bus Zones, phasing out diesel taxis, funding 50 schools air quality audits, setting tighter standards for construction machinery and introducing air quality alerts. He has also created a Cleaner Vehicle Checker so Londoners can check the real-world emissions of cars and vans before buying them.

The benefits of the expanded ULEZ are reported to include:

Approximately 100,000 people will no longer live in areas exceeding legal limits, which is a reduction of nearly 80 per cent in 2021. 

43 per cent fewer roads exceeding limit values in 2020 and 64 per cent fewer in 2021

71 per cent reduction in schools in areas of exceedance in 2021 – rapidly lowering harmful emissions than can reduce lung development in children

In outer London there would be around a 20 per cent reduction in NOx road transport emissions, and in inner London there would be around a 30 per cent reduction in NOx road transport emissions in 2021

Sustrans is a partner of the Healthy Air Campaign along with 17 other health and environmental organistaions. In December 2016 Sustrans signed an open letter with 10 other organisations to the Mayor of London, Sadiq Khan, asking him to ban diesel cars by no later than 2025, to tackle air pollution in London.

Find out more about the Healthy Air Campaign Read our comment in the Guardian  from News https://www.sustrans.org.uk/news/our-response-expanded-london-ultra-low-emission-zone-consultation via IFTTT