Crossword Genius

Air quality index factor (4)

Ross

I believe the answer is:

smog

'air quality index factor' 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 "Smoky fog" , "Pollutant fog" , "Pea-souper" , "Pollution haze/fog" , "Polluted atmosphere" .)

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