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Discussion :: UPSC Civil Service Exam Questions

  1. Which of the following air pollutants is/are responsible for photochemical smog ?
    1. Oxides of nitrogen
    2. Ozone
    3. Unburnt hydrocarbons
    4. Carbon monoxide
    Select the correct answer from the codes given below :

    2. A.
    1 alone
    B.
    2, 3 and 4
    C.
    1, 3 and 4
    D.
    1 and 3

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    Answer : Option D

    Explanation :

    No answer description available for this question. Let us discuss.

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