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The US is among the cleanest. "Shocking" I know.
World's most polluted countries REVEALED - and the worst might surprise you…
https://www.dailymail.co.uk/health/article-12144455/Worlds-polluted-countries-REVEALED-worst-surprise-you.html


Those maps aren't very significant to me. They're mixing / allowing too many variables into the results, including level of medical care and population density and household air conditioning (or lack thereof) and who knows what the hell else.
Greeenland should not be a surprise. If you have a population of two, and one dies of particulate damage (like powdered snow),
voila!, you have a 50% death rate. I'm not really just joking here, but presenting an example of possibilities for statistical hokeyage. (I just now invented that word.)
What I
do see is "hot and dry" = 'high particulate levels," and "hot and dry" = "equatorial-temperate regions." The Sahara, I am told, is a terrific generator of dust pollution in the region.
Terry, 230RN
"Actually, you're much safer with me with a gun than you are with me without a gun."