341–350 of 471 posts
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I have a cheap pm10 meter and ran it continuously for a few weeks. Next too cooking meat the other activity that stood out was blowing out the birthday candles. The pm10 rose to 300 and only was backs to healthy levels (below 50) several hours later. I was as surprised as you are. Next time I'll definitely open a window
How often do you blow out birthday candles?
EVs reduce tailpipe exhaust near roads but it's worth noting that brake abrasion dust isn't going away anytime soon and it's considered very bad to breathe, possibly in the same league as diesel emission particles.[1] I guess regenerative braking on an EV reduces this somewhat. Tire dust is also concerning.[2] [1] https://academic.oup.com/metallomics/article/12/3/371/595624... [2] https://pubmed.ncbi.nlm.nih.gov/2264…
A lot of people don't know how to use engine braking, I guess teaching them that is going to significantly increased your brake pad life on existing vehicles in circulation. Remember there are 3 brakes in your car, handbrake, foot brake and engine braking.
Engine braking (jake braking) by trucks is illegal by statue in many cities and towns because it's very loud. Also, engine braking is riskier in terms of costs (stresses to drivetrain, torque converter, transmission, engine) than brake pads, so people aren't going to do it. Furthermore, they rarely have the skills or transmission to be able to do it conveniently. In addition, if it were more efficient or safer, it would likely be a feature, but I've never seen it in a standard transmission passenger vehicle.
This article seems to make fantastic jumps from the believable -- mortality from overall air pollution (e.g. in Delhi) to the frankly unbelievable -- your ultrasonic humidifier supposedly reducing your life by nearly an hour each night, or that a daily commute between Newark and NYC takes half a year off your life. According to this logic, anyone who works in the subway should be dying, what, 10 years earlier? Which…
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Thank you for all of you interested in getting the PCBs. To send me a message please go to https://www.airgradient.com/diy/ and send me a message with the orange chat button. Thanks!
There was a bit of interest last time I remember you posting on here as well - have you thought about putting up a batch on something like crowd supply? I think it would sell well enough to make it worth your time, and fire season is coming up again soon.
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> anyone who works in the subway should be dying, what, 10 years earlier? From my ad-hoc survey of subway driver friends, this seems about true... Most die in their late 60's in a country where most people make it to 70/80. Obviously the fact their job involves sitting in a chair all day doesn't help things...
Is there a fundamental reason why the subway must be like that? I assume it's not as bad in say Hong Kong? Copenhagen metro for example is automated and there's a wall and automatic doors separating the tracks from the platform. I assume it's quite clean.
1) Dust from brakes, as noted by other comments.
2) Tunnels, and stations in underground spaces, therefor hard to ventilate.
> I assume it's not as bad in say Hong Kong?
No idea, but air quality in the London underground is very bad indeed. I mean you can sometimes see a visible brown haze looking down the length of the platform.
https://airqualitynews.com/2019/11/29/air-pollution-on-londo...
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Thank you for all of you interested in getting the PCBs. To send me a message please go to https://www.airgradient.com/diy/ and send me a message with the orange chat button. Thanks!
There was a bit of interest last time I remember you posting on here as well - have you thought about putting up a batch on something like crowd supply? I think it would sell well enough to make it worth your time, and fire season is coming up again soon.
Thank you for this extensive resource on air quality. Yes, it needs to get more attention as it is one of the main drivers of mortality of environmental risks. One thing one has to bear in mind is that often when you optmize your home for low PM (e.g. with air purifiers and fixing of air leackage) your CO2 will get very high causing headaches and reduce cognitive performance. So it always makes sense for indoor air q…
Can it be powered by a battery, to be portable?
Thank you for this extensive resource on air quality. Yes, it needs to get more attention as it is one of the main drivers of mortality of environmental risks. One thing one has to bear in mind is that often when you optmize your home for low PM (e.g. with air purifiers and fixing of air leackage) your CO2 will get very high causing headaches and reduce cognitive performance. So it always makes sense for indoor air q…
I see the aliexpress link to the PM sensor doesn't work (at least not in the US); where else do you recommend buying one?
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I am interested. Do you ship to Canada (happy to pay the difference/wait for you to figure out the postage rate)?
I too am interested but I'm from Chile. (replying to you to not pollute parent level replies)