The photochemical smog does not generally contain :

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NO₂

SO₂

HCHO

answer is C.

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Detailed Solution

Photochemical smog is the form of air pollution in which the pollutant reacts with the sunlight and forms smog which consists of PAN (Peroxyacetyl nitrate), nitrogen oxides, and other non-volatile compounds.

Carbon dioxide and sulphur dioxide are not involved in photo chemical smog.

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