Smog
/smˈɑɡ/
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Definition
(noun) A noxious mixture of particulates and gases that is the result of urban air pollution.
Sentence Examples
The air was infected with photochemical smog.
The very air we breathe is polluted with smog from the factory chimneys.
CEFR Practice Quiz
The heavy ____ in the city made it difficult for people with respiratory issues to go outside.