Crossword Genius

Mixture of smoke, fog and chemical fumes (4)

Ross

I believe the answer is:

smog

(Other definitions for smog that I've seen before include "Pollutant haze" , "Man-made atmospheric pollution" , "Thick polluted mist" , "Dirty mixture of smoke and fog" , "Industrially polluted air" .)

I've seen this clue in The Mirror.
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