Questions tagged [pm2.5]

PM2.5 is one size classification of airborne particulate matter, but has become a popular catch phrase for any small-sized particulate matter relevant both to atmospheric heating/cooling (as a greenhouse "gas") due to their high thermal emissivity and sunlight absorption, and as a pollutant with health consequences. Other particle sizes can use this tag as well, including PM10, PM1, PM0.1

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How do current pollution levels in Los Angeles compare to the 1970s?

As I understand it there are two key kinds of air pollution: ozone and fine particles. Are there any long-term data series that chart average ozone levels and/or fine particulates over time going ...
Tyler Durden's user avatar
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11 votes
1 answer

Fine particulate matter - Why the lack of attention? What can be done to tackle it?

If fine particulate matter as a pollutant from industrial or natural sources (e.g. a desert) can be such a cause for concern in terms of (further) desertification as well as health impacts, is there a ...
Avestron's user avatar
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10 votes
1 answer

How much worse is the typical subway air, compared to street-level air pollution, in a typical city?

An excerpt from a section about the capital of Taiwan, in an article I wrote about Air pollution in Taiwan: Further more, in greater Taipei, the outdoor PM2.5 concentration in the air at ground-...
O0123's user avatar
  • 311
6 votes
2 answers

How to understand the bizarre high level for both PM2.5 and Ozone

Background Eastern China now (2017.01) are suffering severe haze with striking concentration of PM2.5. Haze, with low visibility and complex chemical components threatens billions of persons' health. ...
Han Zhengzu's user avatar
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5 votes
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How is the concentration of particulate matter calculated per cubic meter

I have some data about PM10, PM2.5, i.e, how much is generated per day (in kilotonnes) by some sector, say from vehicular emissions. It can be converted to micrograms but I don't know how standard ...
y_159's user avatar
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4 votes
1 answer

How can agricultural ammonia lead to PM2.5 production in the atmosphere?

The NPR News article Growing Corn Is A Major Contributor To Air Pollution, Study Finds talks about all sources of pollution associated with growing corn, and it singles out the application of ammonia ...
uhoh's user avatar
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4 votes
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Which particles are classified as PM2.5? How exactly is this defined?

Question When discussing "PM2.5", is there any standardized understanding of which particles are or are not included? Is it everything that's 2.5 microns and smaller? Or Everything between 2....
uhoh's user avatar
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3 votes
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How can I test the Air Quality?

I'm unable to find good sources to make myself an AQI(Air quality Index) measuring device. All I was able to find was the way it is calculated in different regions. ...
iamgr007's user avatar
3 votes
2 answers

Why (and how) is particulate matter measured in mass per volume?

Why are particulate matter measurements (like PM2.5) from an air quality monitor given in micrograms per cubic meter (μg / mm^3)? Specifically, why mass? I assume the device is using an optical ...
Adrian McCarthy's user avatar
2 votes
1 answer

What is a Micro-Aethalometer; how do portable Black Carbon (BC) Monitors work?

The screenshot below is from MIT's Erik Velasco's presentation Particle exposure and dosage on public transport. My question is about the small, portable Black Carbon (BC) monitor. From my reading, ...
uhoh's user avatar
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1 vote
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What's the origin of particulate matter (pm10, pm2 5) [closed]

I would like to ask about origin and inventor of particulate matter pm10, pm2.5. Who published and defined this formulas and when. Thanks in advance!
Kacper Brachaczek's user avatar