Longman Dictionary of Contemporary English homepage

Topic: ENVIRONMENT AND WASTE

Date: 1900-2000
Origin: smoke + fog

smog

 noun
     
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 of smog from the Longman Dictionary of Contemporary English within
the topic ENVIRONMENT AND WASTE
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