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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Assertion: Photochemical smog is a combination of photons with smoke and fog. Reason: Photochemical smog is formed in the stratosphere.