Which statement is not true about photochemical smog?

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Common components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate.

Plants like Pinus, Juniparus can help in reducing the photochemical smog.

Photochemical smog is harmful to humans but has no effect on plants.

Photochemical smog occurs in warm, dry and sunny climate.

answer is A.

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Detailed Solution

Photochemical smog leads to cracking of rubber and extensive damage to plant life.
(2) Reducing photochemical smog:
$\cdot$ By reducing unburnt fuel in automobile exhaust
$\cdot$ Designing automobile engines to release less nitric oxide, and hydrocarbons into atmosphere
$\cdot$ Planting, plants which can metabolize nitrogen oxides.
E.g., pinus, Juniparus, Quercus, Pyrus,
Vitis.
(3) Formation of photochemical smog requires presence of U.V. (from sunlight), thus formed in warm and dry areas.
(4) The components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde, and PAN, all of which affect human health.

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