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There are three approaches to having cleaner air:

1) Reduce the pollutants that get into the air (e.g. reduce factories)

2) Clean or redirect the polluted air in the sky

3) Clean the air in the small space you breathe (domestic air purifiers, or face masks)

(3) is the part individuals can control. (1) is very linked to GDP, and is mostly controlled by goverment policies.

Is anything possible in (2)? Is there a way to blow all the polluted air out of a city, with a huge fan or something?

What about forcing rains through chemical stuff with planes? The rain ~does remove pollutant from the air, right ?

Yes, I think China does that when important foreign dignitaries visit. Or it's just a series of coincidences.

Maybe it's time for Perri-Air (from Spaceballs) to become reality?

apartment lobby as air lock

Request for Startups: Air