Crossword Genius

Urban air pollution (4)

Ross

I believe the answer is:

smog

'urban air pollution' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for smog that I've seen before include "Man-made atmospheric pollution" , "Smoky fog" , "Industrially polluted air" , "Polluted atmosphere" , "Pollutant fog" .)

I've seen this clue in The Star Tribune, The New York Times and the Newsday.
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