Crossword Genius

Pollution that can change the colors of a sunset (4)

Ross

I believe the answer is:

smog

(Other definitions for smog that I've seen before include "Pollution haze/fog" , "Pea-souper" , "Smokey fog" , "Thick polluted mist" , "Industrially polluted air" .)

I've seen this clue in The New York Times.
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