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You can compare the maps for e.g. PM2.5 in New Delhi and LA quite easily:

http://aqicn.org/map/delhi/mandir-marg/#@g/28.6188/77.2405/1...

http://aqicn.org/map/losangeles/los-angeles-north-main-stree...

Quite a lot worse, as you can see!

Thanks, however I think an overall picture/summary that took into account seasonal differences would also be interesting in this context in addition to that type of real time information.

I don't have a link to such seqsonal information but I can tell you that right now is in the ball park of worst case for Los Angeles. We've been hit by some brutal forest fires due to the drought and air quality for the last couple of weeks has been much worse than usual.

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