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re: The most polluted countries in the world

Posted on 4/17/24 at 9:45 am to
Posted by Joshjrn
Baton Rouge
Member since Dec 2008
27296 posts
Posted on 4/17/24 at 9:45 am to
To piggy back off of my last post, it looks like PM 2.5 tends to come from varying kinds of combustion. This is an article from a few months ago specifically about New Delhi, but also makes reference to a few US cities: LINK

quote:

Road dust and tiny bits of, well, stuff sent into the air by stone processing and other crushing operations are common sources of PM 10 pollutants. You can trace PM 2.5, on the other hand, primarily to combustion—fireplaces, car engines, and coal- or fracked (natural) gas–fired power plants are all major PM 2.5 sources. That’s why the five U.S. cities with the highest PM 2.5 levels are all in car-crazy California. Other problem cities have large coal-fired power plants (Pittsburgh), rely heavily on wood stoves for heat (Fairbanks, Alaska), or are prone to wildfires (Medford, Oregon)
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