Crossword Genius

Visible air pollution (4)

Ross

I believe the answer is:

haze

(Other definitions for haze that I've seen before include "Mist or shimmer due to heat" , "Mistiness" , "A thin mist, perhaps from heat" , "'Mist, light fog (4)'" , "Lack of definition or precision" .)

I've seen this clue in the Newsday.com, the Universal, The Guardian, the USA Today and the LA Times.
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