Crossword Genius

Polluted air (4)

Ross

I believe the answer is:

smog

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

This is the entire clue.

(Other definitions for smog that I've seen before include "Pollutant fog" , "Industrially polluted air" , "Pollution haze/fog" , "Dirty mixture of smoke and fog" , "Pollution fog" .)

I've seen this clue in the USA Today, The Guardian, The Sun and The Mirror.
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