Crossword Genius

Visible pollution (4)

Ross

I believe the answer is:

smog

'visible 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 "Fog polluted by smoke" , "Pea-souper" , "Visible air pollution" , "Smoky haze" , "Smoky fog" .)

I've seen this clue in the Universal, the L.A. Times Daily and The Washington Post.
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