Smoking people out brings a bad atmosphere (4)

I believe the answer is:

smog

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'atmosphere' is the definition.
(I have seen 'Polluted atmosphere' mean 'smog' so perhaps 'atmosphere' could also mean 'smog')

I don't understand the rest of the clue.

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(Other definitions for smog that I've seen before include "Smoky haze" , "Fog polluted by smoke" , "Pollution fog" , "Polluted haze" , "Smoky fog" .)

I've seen this clue in the Evening Standard.

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