Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: smoke + fog

smog

 noun
     
Related topics: Meteorology, Geography, Environment and waste
smog [uncountable and countable]
SGE dirty air that looks like a mixture of smoke and fog, caused by smoke from cars and factories in cities
—smoggy adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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