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Assertion : Photochemical smog is mainly...

Assertion : Photochemical smog is mainly composed of nitrogen oxides, volatile organic compounds, ozone and peroxyacyl nitrates.
Reason : Photochemical smog develops in cold weather conditions by the interaction of secondary pollutants.

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Photochemical smog is a condition that develops when primary pollutants (such as oxides of nitrogen and volatile organic compounds) interact under the influence of sunlight to produce a mixture of secondary pollutants. Thus photochemical smog is mainly composed of oxides of nitrogen volatile organic compounds (primary pollutants), ozone and peroxyacl nitrate, PAN (secondary pollutants).
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