Crossword Genius

Air pollution (4)

Ross

I believe the answer is:

smog

'air pollution' is the definition.
(I know that smog is a type of air pollution)

This is the entire clue.

(Other definitions for smog that I've seen before include "Fog polluted by smoke" , "Polluted haze" , "Bad visibility caused by emissions from chimneys" , "Fog and smoke mix" , "Dirty mixture of smoke and fog" .)

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