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  1. The smog is essentially caused by the presence of

    2. A.

     O3 and N2
    B.

     O2 and N2
    C.

     Oxides of N and S
    D.

     O2 and O3

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    Answer : Option C

    Explanation :

    Photochemical smog is caused by oxides of sulphur and nitrogen.

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