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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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 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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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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After days of smoky air, why is it healthier to stay inside?

A large wildfire has been burning for four days some distance from my town. The air is smoky, but not smokier than yesterday or the day before. General wisdom holds that we should all stay indoors. ...
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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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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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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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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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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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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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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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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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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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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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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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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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How can ice crystals with adsorbed chlorine remain over the south pole all winter?

I just saw the Periodic Video Ozone on Bondi Beach - Periodic Table of Videos where the impact of Chlorine from CFCs on Ozone is discussed. At around 04:00 or so, ...
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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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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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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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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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How Can Smog in Metropolitan Cities like Delhi & Beijing Be Reduced?

These two cities are facing the worst smog in Asia and I think in the world and people of these cities have no choice other than to wear masks when going outside. ...
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118 views

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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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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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. ...
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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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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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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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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 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 ...
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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-...
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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. ...
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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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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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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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Where do bad smells eventually go?

Suppose that I haven't taken a shower for a while, or haven't disposed of my trash, or something, and the room I've been in now stinks. Then, to remove the smell from the room (presumably after first ...
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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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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 principles do we consider when selecting an air pollution monitor location?

I'm working on a project aiming at finding some potential point as a new air pollutant monitor site for a city to measure $SO_2$, $NO_2$, $PM_{2.5}$, etc. After modeling the surface concentration of ...
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How to relate the backward trajectories with offline particular samples?

To correlate chemicals in aerosols emanating from certain sample points, backward trajectory analysis is usually applied for identifying the potential geographical source region. In this figure ...
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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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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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What is a temperature inversion and can it trap smog/pollution?

Just as the title says, I heard about this term but am not sure how it works.
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How to transform the inventory data from degrees to kilometers

First all, my question was different from the question Converting grid resolution from degrees to kilometers. In chemical transport modeling, the pollutant source inventory was an essential input ...
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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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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 ...