noun
EXAMPLES FROM CORPUS
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Ethyl Corp. says it reduces smog and presents no threat to cars or public health.
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Eventually, smog-check stations are expected to electronically transmit smog certificates directly to the Department of Motor Vehicles.
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Flagged motorists will be notified by mail that they must get a smog check and have their autos repaired, Kniestedt said.
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Hydrocarbon smog from traffic; smoke from a coal-fired power station.
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In sunlight, VOCs can react in the lower atmosphere with nitrogen oxides to generate photochemical smog .
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On 75 days the smog was so bad that schoolchildren were advised to stay indoors.
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So did women who gave birth after the thick London smog of 1952.
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The streets are clean, there's no smog to dull the sunshine, and the skyscrapers don't overpower.