Photochemical smog - effects and composition

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  1. Which statement is not true about photochemical smog?
    A Photochemical smog is harmful to humans but has no effect on plants.
    B Plants like Pinus, Juniparus can help in reducing the photochemical smog.
    C Photochemical smog occurs in warm, dry and sunny climate.
    D Common components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate.