American English

Definition of smog noun from the Oxford Advanced American Dictionary

 

smog

 noun
noun
NAmE//smɑɡ//
 
, NAmE//smɔɡ//
 
[uncountable, countable]
 
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a form of air pollution that is or looks like a mixture of smoke and fog, especially in cities attempts to reduce smog caused by traffic fumes
 
adjective
See the Oxford Advanced Learner's Dictionary entry: smog