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    Question

    Smog is a combination of

    –
    A Air and water vapours Correct Answer Incorrect Answer
    B Water and smoke Correct Answer Incorrect Answer
    C Fire and water Correct Answer Incorrect Answer
    D Smoke and fog Correct Answer Incorrect Answer

    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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