Questions tagged [air-pollution]

Air pollution is the introduction of particulates, biological molecules, or other harmful materials into Earth's atmosphere, causing diseases, allergies, death to humans, damage to other living organisms such as animals and food crops, or the natural or built environment.

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Estimating meteorological visibility from air chemical and particulate composition

I have found here an answer that provides formula that only takes into account vapors, pressure and temperature - What is the formula used for atmospheric visibility? Is there an approach that also ...
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Clarification of dry deposition of particles

I found a formula for the dry deposition speed of particles and an electric circuit analogy to go with it. I would like some clarification on this figure: I'm mostly interested in the top right ...
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gridded air pollution data for Japan

Do you know of any database where I can get past air pollution (sulfur oxides (SOx) - nitrogen oxides (NOx) - photochemical oxidants (Ox) - particulate matter (PM) - suspended particulate matter (SPM) ...
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How does the WHO calculate the interaction of mortality effects from indoor and outdoor air pollution?

The WHO's landing page on air pollution includes three different estimates of deaths due to air pollution: 7 million total 4.2 million due to outdoor (ambient) air pollution 3.8 due to household (...
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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 ...
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Emission factor for Arsenic [closed]

What emission factor for natural gas boiler should be used for arsenic other than AP-42? I need to to calculate emissions from natural gas boiler. What emission factor for arsenic would be the best to ...
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3 votes
1 answer
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What is the cause for large circular areas of air pollution?

Looking at the layer "Air Quality" on my iOS weather app there seem to be large circular areas of air pollution outside of large cities. What could be the cause for such phenomena? UPDATE I ...
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Folium/Leaflet tiles for air pollution modelling

I am using land use regression with machine learning to create an air pollution model. However, almost all tiles I can find using Python and Folium contain text, which my intuition says cannot ...
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6 votes
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Would home heat pumps provide large benefits against climate change?

Some facts I have learnt The Global Warming Potential (GWP) was developed to allow comparisons of the global warming impacts of different gases. Specifically, it is a measure of how much energy the ...
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6 votes
2 answers
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What meteorological data is needed for air quality machine learning models?

Are there any studies that discuss what meteorological data I should look at if I am creating an air quality model with machine learning? That is, what should I extract from NCEI or ERA5 first if I ...
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convert mol/m2 to μg/m3 [duplicate]

Sentinel-5P satellite provides high-resolution data products on concentration levels for several atmospheric trace gases (NO2, SO2, O3, and others), which are measured in mol/m2 within the total or ...
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3 votes
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What meteorological features accompany/cause a thermal inversion?

I am physics grad student working on a problem of making a statistical (neural network) prediction of the air pollution in a city. I am provided with hourly values for ca. a dozen meteo features of ...
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Could the phrase 'human made environmental disaster' be applied to illegal and deadly city wide pollution?

The city in which I live has a number of roads that are regularly above the legally allowed yearly average level of nitrogen dioxide permitted (40ug/m3). One road is almost double that limit (77ug/m3)...
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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 ...
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3 votes
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What is the appropriate name for air pollutant chemical formula like notation?

Consider air pollutants like carbon monoxide and nitrogen dioxide for which we use their chemical formulas, $\ce{CO}$ and $\ce{NO2}$ respectively, as a way to compactly refer to them when writing ...
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What pollutants can be next to a wood processing plant with formaldehyde factory?

I used to live in an are with a large factory that processes timber then uses the splinters to create OSB and other wood composites. They also have a formaldehyde factory for producing their own ...
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3 answers
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Why does air pollution comes with cold weather in tropical areas?

I reside in Bangkok where the local press have reported several times these two last months November-December about high levels of smog. A similar phenomenon occurred last year in this period (end of ...
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How to generate inputs for the MUNICH model from the VEIN model

MUNICH is the Model of Urban Network of Intersecting Canyons and Highways (MUNICH) (Kim et al., 2018) and VEIN is the Vehicular Emissions INventory model (Ibarra-Espinosa et al, 2018), an R package. ...
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Is there a conventional list of pollutants to consider for calculations? Or an updating one even?

In researching economic damage from various pollutants, I often find that it's very random sources that inform me of various pollutants I need to be mindful of in calculations. Is there any kind of ...
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Urgent, Please help, where can I find worldwide standards of manganese mining?

Hi everybody who sees this post, I need urgent help for finding all official world wide standarts of the manganese mining. Problem is that, many houses has been damaged in my village with manganese ...
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1 vote
1 answer
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How can I specifiy a substance in AERMOD?

Since I use OTHER as a pollutant ID, are there some parameters I could specify in order to get better results for dispersion of substance I am trying to model? eg. molecular weight or density?
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Is pollution the reason why rainbows are so rare nowadays?

Today I saw a rainbow after almost a decade. I live in Noida (a city) in India. Most people I know believe that: we don't see rainbows nowadays because of pollution and now after nearly 3 months since ...
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Independent sources of information on radiation pollution in Europe

Bear with me if this is a wrong place to ask this question. I aksed this question on Physics at StackExchange and was told it will be more on topic here. Recent news show a fire has started close to ...
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2 answers
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Why is Paris still polluted during the Covid-19 shutdown?

It does not seem that the air pollution level is getting any lower in Paris during the current shutdown due to COVID-19. Why is that? There are fewer cars. Are they only a small part of Paris' air ...
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2 votes
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The effect of the 2019-2020 bushfires/wildfires in Australia

What was the total damage of the 2019-2020 bushfires/wildfires in Australia?
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7 votes
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Convert NO2 concentration in Sentinel-5P data from mol/m2 to μg/m3 on the ground level

Sentinel-5P satellite provides high-resolution data products on concentration levels for several atmospheric trace gases (NO2, SO2, O3 , and others), which are measured in mol/m2 within the total or ...
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24 votes
1 answer
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What's causing this high SO2 concentrations in Kazakhstan?

I was using this website for weather conditions around the world called Ventusky (https://www.ventusky.com/) and one of its features allows you to view SO2 concentration. I stumbled upon this high ...
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4 votes
3 answers
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Are atmospheric halogen oxides "supposed to be" in the atmosphere? Where do they come from?

I like to naively think of Earth's natural atmosphere as nitrogen, oxygen, argon, water, carbon dioxide and okay, some nitrogen and sulfur oxides, and again okay, a little hydrogen and methane from ...
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District/province wise air quality data for South Asia (2010 onward)

I would like to create a district/province-level air quality data for all the countries in South Asia from 2010 onward using satellite data. As someone with absolutely zero background in remote-...
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2 votes
1 answer
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What creates so much pollution in Africa?

Using AirVisual app I notice there is a huge patch of pollution in Africa. I cannot imagine there is a big economic activity to support that huge pollution across almost the whole continent. What ...
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What is the reason for this high outdoor VOC level with strange pattern of slow rise and sudden falling?

I have an Atmotube Pro air quality sensor placed outside in a cup with a large bowl placed over the top of it to protect it from the wind and any rain but to allow air to filter through easily. I'm ...
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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!
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5 votes
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How can methylmercury in the ocean be reabsorbed into the atmosphere?

The Sacramento Bee news article Toxic fog may be poisoning some of California’s mountain lions, study says says Algae in the ocean convert mercury to methylmercury, its most toxic form, which can ...
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1 vote
2 answers
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Does Start / Stop technology in cars have an impact on air quality? [closed]

I have repeatedly heard from various car enthusiasts that start stop technology has no benefit (or the tiniest smallest negligble benefit) to air quality so they turn it off entirely. Does it have an ...
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1 vote
1 answer
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Origin of Serious Wildfires

At a very rough estimate, what proportion of wildfires are caused by natural events like lightning? I am absolutely sure that in Europe, where there are often wildfires, the sun is never hot enough to ...
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2 votes
1 answer
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Origin of Sulphuric Acid in the Atmosphere

I often see claims that volcanic emissions of sulphur dioxide, on Earth and on the planet Venus, creates sulphuric acid when it combines with water vapour. It doesn't. Sulphur dioxide creates ...
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2 votes
1 answer
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Atmospheric conditions needed that blocks all bright light during sunsets and allows you to stare directly at the sun

Today (July 5th, 2019 just before 8 pm KST), along the Han River in Seoul, the surface of the sun could be viewed with my naked eye (no protection needed), and this was safe on the eyes. It appeared ...
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1 vote
1 answer
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What is the Carbon Footprint of not changing car oil?

I am on my second vehicle that I have stopped changing my oil after the car has been broke in or around 90k. The first car I made it 400k miles before the rear end went out. The second car I'm at 130k ...
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6 votes
1 answer
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Are these plane trails seen from satellite

Here are photos from West of Normandy, at 7-9am after sunrise on the 14th of may, from the visible satellite. It's a bit strange that they are visible from space, they are 2-3 miles wide? Are they jet ...
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2 votes
1 answer
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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, ...
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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....
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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 ...
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6 votes
2 answers
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Is pollution a contributing factor to freezing rain?

I have been to different places with nearly the same freezing temperatures, around -2°C, but only at some specific places I repetitively experienced freezing rain. One common factor at these places ...
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4 answers
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What are the technical solutions to measure $\ce{CO2}$ emissions?

I'm currently at COP24 (United Nations Climate Change Conference) in Katowice, Poland. (some editing since I took a screenshot of my laptop) I've asked some guys about $\ce{CO2}$ emissions but very ...
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1 vote
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To what extent does lightning produced NOx end up in the atmopsheric boundary layer?

Lightning produced NO$_{x}$ (emitted as NO but quickly converted to NO$_{2}$) can be one of the major sources of atmospheric NO$_{x}$ in the tropics [1]. Estimates of emissions per flash range from 10 ...
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What are the benefits of direct sun viewing spectrometer over a backscatter measuring spectrometer to quantify trace gases in the atmosphere?

I am using a Pandora spectrometer and a MAX-DOAS spectrometer to quantify the amount of formaldehyde (HCHO) present in the troposphere and stratosphere in Fairbanks, Alaska. Both the spectrometers use ...
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3 votes
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The difficulties for the simulation of atmospheric metals

Atmospheric metals usually reside in aerosols with complex source origins. The concentrations distribution of metals especially for those with high toxicity (Pb, Cd, Ni, V) should be informative for ...
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5 votes
2 answers
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How to map emission inventory from lat&lon corrdinate to WRF model grid

Here, I have a regional emission inventory, which mainly contains the varibales of lat,lon,...
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11 votes
1 answer
3k views

How to tell the difference between real rain and fake rain (cloud seeding)?

I live in a city where the pollution is bad, so bad that sometimes we get 'fake' rain (from cloud seeding). This may last for an extended period. There have been times before when it has “rained” and ...
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6 votes
1 answer
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Are there standards for tropospheric NO2 levels considered low or high?

I'm working with Ozone Monitoring Instrument (OMI) $\ce{NO_2}$ vertical column density (molecules/cm2) data. To help interpret the values, I'm wondering if there are standards that show which values ...
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