Questions tagged [particulates]

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Is Luleå's PM10 indicative of poor air quality?

Today (17/04/2023) Luleå in Sweden has one of the lowest air quality values in the world according, to Microsoft's air quality map. Other regions with a similar value are near deserts or large urban ...
OrigamiEye's user avatar
4 votes
2 answers
746 views

But what exactly is "black carbon" in the context of snow-melting particulates reaching Antarctica?

CNN's What is black carbon? The latest way humans are causing changes in Antarctica doesn't actually say anything about what black carbon is. Neither does The Guardian's Black carbon pollution from ...
uhoh's user avatar
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13 votes
1 answer
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What is an "exquisitely rare pollen corona"? How can pollen produce several tight rainbow circles around the Sun, and why pollen specifically?

The Forrest Mims YouTube video An Exquisitely Rare Pollen Corona shows a pair of rings closely circled around the Sun with rainbow colors; blue on the inside. The first annulus is easy to see, the ...
uhoh's user avatar
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5 votes
2 answers
836 views

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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5 votes
1 answer
272 views

How to estimate the settling time of atmospheric particulates as a function of aerodynamic size?

Understanding the behavior of particulates in the atmosphere is important for modeling climate, weather and public health. They can be nucleation sites for rain, fog and smog, they can have thermal ...
uhoh's user avatar
  • 7,096
1 vote
0 answers
57 views

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
1 vote
0 answers
95 views

Can airplanes trigger rain?

A lady was telling me that the lower clouds were contrails left from plane exhausts. I looked up and there were none I could see in the sky she pointed to Stratocumulus Clouds. I did not want to tell ...
Muze's user avatar
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2 votes
1 answer
418 views

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
  • 7,096
4 votes
1 answer
348 views

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
  • 7,096
2 votes
1 answer
570 views

How salty can snow/sleet be?

Can enough salt particulates be in the air to create salty snow or ice that is undrinkable? Will ice form in sub zero temperatures through condensation in salty air?
Muze's user avatar
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3 votes
1 answer
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How would a particle travel in a hurricane?

How would a particle other then water travel in a hurricane? At what buoyancy or height would a small air born life preserver be safe from the ground in a hurricane? How fun would that be?
Muze's user avatar
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10 votes
1 answer
175 views

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
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11 votes
2 answers
3k views

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
227 views

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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