I’m looking for a set of time historical graphs of air quality for a representative set of cities. Anyone know of one? I’m only finding current ones or unusable reports. I’d like to know how bad 174 is in relation to (for example) 10 year historical trends for Beijing and Delhi
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This isn't that, but I did find a map of average ambient particulate matter air pollution. It looks like some parts of China averaged more than 80 μg/m3 of PM2.5 in 2005.
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Hmm, yes sandstorms would put a lot of particulate matter into the air. 😂

