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8 votes
Accepted

How is the concentration of particulate matter calculated per cubic meter

The data that you are having are called emission fluxes. If these data are available as global averages then one can calculate global mean concentration by multiplying the residence time of the ...
Harish's user avatar
  • 797
7 votes

How do I convert Sentinel-5p / TROPOMI vertical column density to concentration?

The unit mole / m² has dimensions count per area; the unit µg / m³ has dimensions mass per volume. To go from a quantity per area to a quantity per volume, you need to understand some properties of ...
gerrit's user avatar
  • 11.7k
6 votes
Accepted

The difference of vertical advection and convection process for chemistry species

The difference between advection and convection in Chemistry Transport models (CTMs) is a question of scale: Advection is driven by winds that are provided by the meteorological input dataset. Thus, ...
daniel.heydebreck's user avatar
6 votes

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

I think it is important to keep in mind the mechanisms that form PM$_{2.5}$ are different than the mechanisms that form O$_3$. From the data your provided you can draw some simple conclusions: ...
BarocliniCplusplus's user avatar
5 votes

How will air quality, weather and climate improve because of the containment, social distancing and lockdown during the COVID-19 outbreak?

This is a topic of almost continual discussion in the South China Morning Post, scmp.com , an English language newspaper in Hong Kong. This is both because air quality is a major problem in China (but ...
David Lloyd-Jones's user avatar
5 votes

How Can Smog in Metropolitan Cities like Delhi & Beijing Be Reduced?

The first thing to do is to stop putting pollution in the air, particularly very small particulate matter that are produced by combustion. For the Beijing Olympic Games of 2008, the Chinese ...
Fred's user avatar
  • 24.7k
5 votes
Accepted

How can I test the Air Quality?

The AQI calculation does not require that all pollutants be measured. Instead, it uses the pollutants that are available and then uses a function (chosen by the overarching regulatory agency) that ...
f.thorpe's user avatar
  • 13.6k
4 votes

Are there plants or bacteria that perform NO2 fixation and how relevant are they for improving local/regional air quality?

NO2 uptake by plants It has been observed that plants can lead to a reduction of atmospheric NO2 concentrations [Breuninger et al, 2013]. Currently, it is assumed that NO2 is taken up through stomata ...
daniel.heydebreck's user avatar
4 votes
Accepted

Does hydroxyl radical chemistry in air quality models create numerical stability problems?

The hydroxyl radical chemistry is not modeled explicitly in air quality models, so numerical stability is not an issue. Instead, OH is held in pseudo-steady-state. For instance, see CMAQ's ...
f.thorpe's user avatar
  • 13.6k
4 votes

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

Ozone is most closely correlated to temperature. Yes you need NOx and VOCs to create ozone, but you also need enough photolysis driven by sunlight in order for ozone to form. The day analyzed in the ...
f.thorpe's user avatar
  • 13.6k
3 votes

Which types of trees clean the air best?

Evergreen trees grow faster than most hardwood deciduous trees, so their absorption and oxygen emission is greater. Note that trees do not "clean" air. Plants emit oxygen which is why air in ...
Tyler Durden's user avatar
  • 1,804
3 votes

What are the technical solutions to measure $\ce{CO2}$ emissions?

In addition to satellite measurements of carbon dioxide, there are numerous ground based stations that also measure carbon dioxide: Italy, Hawaii, Australia, just to name a few. If you want to catch ...
Fred's user avatar
  • 24.7k
3 votes

Does hydroxyl radical chemistry in air quality models create numerical stability problems?

In fact, there are many chemical transport models which solve the radical chemistry without steady-state approximations. The equations are very stiff but can be integrated with suitable methods, ...
jvir's user avatar
  • 391
3 votes

How Can Smog in Metropolitan Cities like Delhi & Beijing Be Reduced?

I add some information here to present the control strategies which have been done by China government. A series of paper have reported that coal combustion is the main cause of the air pollution ...
Han Zhengzu's user avatar
  • 2,459
3 votes

How is the concentration of particulate matter calculated per cubic meter

You mention "volume" which is the crux of the problem: the surface mixing layer changes height throughout the day as solar heating influences the surface. Consider that the same emission ...
f.thorpe's user avatar
  • 13.6k
3 votes
Accepted

How do I convert Sentinel-5p / TROPOMI vertical column density to concentration?

What you are suggesting is possible in theory but futile for any practical purposes. The concentrations of pollutants varies vertically throughout the atmosphere, so calculating a single value that ...
f.thorpe's user avatar
  • 13.6k
3 votes

What meteorological data is needed for air quality machine learning models?

From Seigneur C., Dennis R. (2011) (free access here, probably not in the final published form): Inputs to air quality models include the emission rates of primary air pollutants and precursors of ...
Pat's user avatar
  • 362
3 votes
Accepted

What meteorological data is needed for air quality machine learning models?

The variables needed for machine learning are different than a standard air quality model. It's actually a much shorter list because you don't have to numerically model atmospheric motion/chemistry/...
f.thorpe's user avatar
  • 13.6k
3 votes

What is the cause for large circular areas of air pollution?

The blob near Reno Nevada is not the Anaconda copper mine, which ceased processing activities in 2000 and is currently being rehabilitated. The blob of airborne pollution is most likely due to the gas ...
Fred's user avatar
  • 24.7k
3 votes
Accepted

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)? The fundamental measurement for particulate matter is done using a ...
f.thorpe's user avatar
  • 13.6k
2 votes

How can I account for rainfall effects on air pollution?

Sounds like you want a dataset that is unadjusted for rainfall. I'm not sure what you have to gain from that, but there are ways to do it. One way to do this would be to find the inverse correlation ...
f.thorpe's user avatar
  • 13.6k
2 votes

How Can Smog in Metropolitan Cities like Delhi & Beijing Be Reduced?

What advanced method? Stop burning fossil fuels. Run vehicles on electricity. Produce electricity using solar/wind/nuclear methods. Develop new methods. Sell methods to other countries. Profit!
Gimelist's user avatar
  • 23.1k
2 votes

Was rural visibility (air transparency) longer in pre-industrial times?

Pre-industrial would mean that a lot of energy use would be the in-efficient use of wood burning. I recall that part of J. S. Bach's payment at one of his posts was firewood provided by his employer -...
Sherwood Botsford's user avatar
2 votes

How to speciate EDGAR emissions for CBMZ?

I used the R package eixport (Ibarra-Espinosa et al., 2018) to download EDGAR data (5 and spec voc 4.3.2) and then include several speciations for chemical mechanisms according to Carter (2015) and ...
Sergio's user avatar
  • 412
2 votes
Accepted

How is Air Quality Index relevant to both PM2.5 and NO2

Most locations in the US don't see high concentrations of pollutants like NO2 and CO anymore. They are largely no longer an air quality problem and air is "Good" in regards to those pollutants. ...
f.thorpe's user avatar
  • 13.6k
2 votes

What are the technical solutions to measure $\ce{CO2}$ emissions?

I'll add to Freds answer and just provide some detail about the satellite measurements: The keyword you're looking for is "remote sensing of the atmosphere" or "remote sensing of XYZ", where XYZ is ...
AtmosphericPrisonEscape's user avatar
2 votes

What are the technical solutions to measure $\ce{CO2}$ emissions?

There is an EU programme having exactly this aim. See this press release. Monitoring anthropogenic CO2 emissions needs the combination of in-situ measurements, satellite observations and modelling of ...
Basileios's user avatar
  • 407
1 vote

How to generate inputs for the MUNICH model from the VEIN model

First, download a project with vein and estimate vehicular emissions. Some projects are here: https://atmoschem.github.io/vein/reference/get_project.html ...
Sergio's user avatar
  • 412
1 vote

Does Start / Stop technology in cars have an impact on air quality?

From Wikipedia: In automobiles, a start-stop system or stop-start system automatically shuts down and restarts the internal combustion engine to reduce the amount of time the engine spends idling, ...
Jan Doggen's user avatar
  • 2,679

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