Crossword Genius

Pollution (4)

Ross

I believe the answer is:

smog

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

This is all the clue.

(Other definitions for smog that I've seen before include "Pea-souper" , "Polluted atmosphere" , "Smokey fog" , "Pollution haze/fog" , "Fog and smoke mix" .)

I've seen this clue in The Mirror and the Penny Press.
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