E.P.A. concern (4)

I think it could be either:

Which length description are you looking for?:

smog

(Other definitions for smog that I've seen before include "Pollutant fog" , "Fog and smoke mix" , "Industrially polluted air" , "Bad visibility caused by emissions from chimneys" , "Pollution fog" .)

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

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