Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN). X is:

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Photochemical smog is formed on the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere.

${N O}_{2} (g) \overset{h v}{\to} N O (g) + O (g)$

Oxygen atom (nascent) is very reactive and combines with O₂in air to produce ozone.

$O (g) + O_{2} (g) \to O_{3} (g)$

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