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.

Filter by
Sorted by
Tagged with
5
votes
1answer
133 views

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 ...
3
votes
5answers
255 views

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. ...
1
vote
1answer
87 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 ...
2
votes
1answer
33 views

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 ...
3
votes
2answers
121 views

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. ...
2
votes
1answer
38 views

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 ...
1
vote
1answer
53 views

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 ...
6
votes
2answers
122 views

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 ...
2
votes
1answer
189 views

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 2.5 and 0....
10
votes
2answers
1k 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 ...
9
votes
1answer
133 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-...
6
votes
2answers
196 views

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. ...
2
votes
1answer
56 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, ...
4
votes
1answer
165 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 ...
4
votes
4answers
127 views

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 ...
15
votes
1answer
603 views

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 ...
5
votes
2answers
260 views

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,...
1
vote
0answers
43 views

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 ...
10
votes
1answer
234 views

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 ...
7
votes
1answer
65 views

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 ...
4
votes
0answers
53 views

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 ...
2
votes
0answers
52 views

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 ...
6
votes
3answers
15k views

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.
4
votes
0answers
224 views

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 ...
11
votes
1answer
1k 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 ...
6
votes
1answer
99 views

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 ...
3
votes
1answer
63 views

The influence of special emissions (possibly coal mining activity) on particulate matters

Based on multiple site sampling of airborne $PM_{2.5}$ and $PM_{10}$ , the elemental concentrations of the trace elements were analyzed. I have found out in the site near surface coal mining zone ...
5
votes
1answer
76 views

What controls the tendency of trace elements in different particle size fractions?

Trace element atmospheric particles are introduced from different sources, with both anthropogenic and natural origins. By analyzing the concentration levels of 18 elements in samples of $PM_{2.5}$ ...
8
votes
0answers
138 views

What meteorological factors contribute to springtime Trans-Pacific air-pollution events?

The transport of tropospheric ozone, ozone precursors, carbon monoxide, etc from Asia to North America is an active area of research (see J.L. Ambrose, et al., 2011) These types of events occur ...
6
votes
3answers
617 views

Which chemicals in smog obscure visibility?

I know that smog is generally a mixture of various chemicals, such as peroxyacetyl nitrate (PAN) and ozone. I also know that smog obscures visibility. My question is two-fold: What chemical in smog ...
2
votes
0answers
87 views

vehicular pollution [closed]

Is there any way to convert the vehicular emissions from cars during journey to oxygen or safer gases to eliminate/decrease vehicular pollution? My question is keeping in mind most populated and ...
1
vote
0answers
97 views

Dry deposition of the total sulfate deposition in forested region

Sulfate is one important inorganic aerosol in the atmosphere. It's subject to removal by two main mechanisms. Wet deposition which include rain/wash-out and cloud deposition. Dry deposition ...
3
votes
0answers
87 views

The factors should be considered to determine one specific pollutant originated from regional transportation?

Ideally, one pollutant (e.g. organic carbon, heavy metals, sulfate) should be the mixed result of local emissions and regional transportation. To quantify the contribution of local emissions is of ...
3
votes
2answers
45 views

How can I account for rainfall effects on air pollution?

How can I adjust black carbon surface mass air pollution concentrations (ug/m3) for rainfall effects? Specifically, I have monthly and daily averaged black carbon pollution data (i.e. 2.0ug/m3 Jan ...
3
votes
1answer
90 views

What control the atmospheric lifetime of different metals in aerosols?

Background I'm analysing the metallic elements in $PM_{2.5}$ to identify their possible anthropogenic sources for the study area. A total of 19 metallic elements were investigated including dust-...
1
vote
1answer
35 views

Haze in Arizona / Grand Canyon that gets more apparent around noon - smog or something else?

I just came back from the Grand Canyon, and it's awesome. However, my friend and I did notice something - it seems that there's some kind of haze in the far horizon that seems worse as the sun rises ...
4
votes
2answers
99 views

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. ...
1
vote
1answer
50 views

Less pollution: moving hurricane debris to other regions for use, or burning?

When a big hurricane hits, it can create debris on the scale of $\mathrm{10^8 yd^3}$. Cities in Florida, Texas, and other affected areas are struggling to hire enough trucks and drivers to pick it up ...
4
votes
0answers
156 views

How to explain the diurnal variation for different seasons

In a recent work, I'm trying to figure out the pollution situation of my case area. Dealing with the online equipments, I have got the PM2.5 and PM10 concentration time series for a whole year. I ...
11
votes
2answers
229 views

How to remove 'silk braid' noise in satellite data?

Satellite remote sensing data is a powerful tool for researching the spatial distribution and temporal variation of atmospheric species. Aura is one satellite owing to NASA which meaning ...
8
votes
1answer
1k views

What's the background concentration of trace gas/pollutants?

I have read a paper discussing the concentration of air pollutants and their background concentration. In the paper Characterization of background air pollution exposure in urban environments using a ...
2
votes
1answer
127 views

What is the impact of climate change on tropospheric ozone production and vice versa?

I know ground ozone reduce the photosynthesis rate of vegetation and could lead to increase respiration and hence more CO2 in the atmosphere, contributing to global warming. But what is the opposite? ...
5
votes
0answers
43 views

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, ...
3
votes
0answers
67 views

How is water surrounding an area of pollution, able to 'trap' that pollution, or otherwise deteriorate air quality?

An article seems to assert that air pollution can be held in place (or 'trapped') by high mountains surrounding the area of air pollution. This seems very understandable. But the same article seems ...
3
votes
1answer
97 views

How much Sulfur Dioxide is emitted into the atmosphere from a mine fire?

Since burning coal leads to a variety of air pollutants, presumably a coal mine fire would also lead to air pollutants. My question is whether there have been any published studies on the emission ...
7
votes
1answer
343 views

What's the prospect of air quality forecasting based on machine learning?

Air quality forecasting models which are useful for atmospheric scientist and government can be built based on numerical theory or statistic theory. The first approach outline the basic physics ...
4
votes
1answer
67 views

The higher value range for the same satellite product (NO2_OMI_TEMIS)

I'm dealing with NO2 column density of troposphere, and my data source is TEMIS. The NO2 level3 data can be derived from the original information of OMI instrument. I have downloaded two types of ...
3
votes
0answers
45 views

How is it determined whether an air pollutant is “hazardous”?

The US EPA has a list of 187 air pollutants that they consider "hazardous". These toxic pollutants are known or suspected to cause cancer or other serious health conditions. How is it determined ...
6
votes
3answers
1k views

Why are inversion layers so important in meteorology?

I keep hearing the term "inversion layer" when reading about pollution and meteorology. I know it vaguely amounts to "some place where the gradient of temperature is inverted". But why are inversion ...
8
votes
2answers
249 views

Could a reported rainfall pH of 3.1 actually be realistic?

In this Chemistry question Is there any reason to fear personal exposure to rain with a pH of 3.1? I haven't gotten any answer, but there was some discussion about the reality of the measurement. So ...