Crossword Genius

Atmospheric pollution (4)

Ross

I believe the answer is:

smog

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">atmospheric pollution</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

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

I've seen this clue in The Mirror.
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