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English definition of “smog”

smog

noun [C/U]    /smɑɡ, smɔɡ/
air pollution caused by smoke or chemicals mixing with fog : [U] We get a lot of smog downtown . [C] A poisonous smog killed 20 people . smoggy    /ˈsmɑɡ·i, ˈsmɔ·ɡi/ adjective a smoggy city / day
(Definition of smog noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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