Question
Smog is a combination of
–Solution
Smogisatypeofairpollution;the word "smog" was coined in the early 20th century as a portmanteau of the words smoke andfogtorefertosmokyfog.Thewordwasthen intendedtorefertowhat was sometimes known as pea soup fog, a familiar and serious problem inLondonfromthe19thcenturytothemid20th century. This kind of smog is caused by the burning of large amounts of coal within a city; thissmogcontainssootparticulatesfromsmoke, sulfur dioxide and other components.
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