Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxyacetyl nitrates (PAN) and so forth X is

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Chemical pollutants in photochemical smog are nitrogen oxides (NO and $N O_{2}$ ), volatile organic compounds, ozone $(O_{3})$ , peroxyacetyl nitrates.

In the presence of sunlight of the following reactions take place

$N O_{2} \overset{h v}{\to} N O + O$

$O + O_{2} \to O_{3}$

$O_{3} + N O \to N O_{2} + O_{2}$

Hence, it consists of excessive amount of ozone melecules.

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