Crossword Genius

Smoky fog (4)

Ross

I believe the answer is:

smog

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smoky fog</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for smog that I've seen before include "Pollution haze/fog" , "Pea-souper" , "Dirty mixture of smoke and fog" , "Pollutant haze" , "Polluted haze" .)

I've seen this clue in the Penny Press and The Times.
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