Crossword Genius

Noxious exhalations (6)

Ross

I believe the answer is:

miasma

(Other definitions for miasma that I've seen before include "Oppressive atmosphere" , "Unwholesome or foreboding atmosphere" , "Unpleasant vapour or influence" , "Pollution in the atmosphere" , "Bad air" .)

I've seen this clue in the Sydney Morning Herald.
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