Photochemical smog always contains:

O_{3}

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C O

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{C O}_{2}

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{C H}_{4}

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Solution

The correct option is A $O_{3}$
Smog is a particular type of air pollution, that results from the burning of fossil fuels.
Ozone ( $O_{3}$ ) is the most important photochemical oxidant in the troposphere, it is formed by the photochemical reactions in the presence of $N O_{2}$ and VOC'S.

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