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English definition of “smog”

smog

noun [S or U] uk   /smɒɡ/ us    /smɑːɡ/
C1 a mixture of smoke, gases, and chemicals, especially in cities, that makes the atmosphere difficult to breathe and harmful for health: Smog is a major problem in Athens. As we flew into the airport, we could see a murky yellow smog hovering over the city.
smoggy
adjective uk   /ˈsmɒɡ.i/ us    /ˈsmɑː.ɡi/
Mexico City is one of the world's smoggiest capitals.
(Definition of smog from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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