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Discussion :: Environmental Science

  1. Which of the following group of gases cause photochemical smog?

    2. A.

     Ozone, PAN and CO
    B.

     HC, NO and PAN
    C.

     O2, PAN, and NO2
    D.

     O3, PAN and NO2

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    Answer : Option D

    Explanation :

    O3, PAN and NO2 cause photochemical smog.

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