How is ozone formed in photochemical smog?

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(B) Photochemical smog is formed by the reaction of nitrogen oxides $(NO_x)$ and hydrocarbons in the presence of sunlight.
$1$. Nitrogen dioxide $(NO

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By the reaction of $O_2$ with atomic oxygen.

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(B) Photochemical smog is formed by the reaction of nitrogen oxides $(NO_x)$ and hydrocarbons in the presence of sunlight.
$1$. Nitrogen dioxide $(NO_2)$ undergoes photolysis in the presence of sunlight to produce nitric oxide $(NO)$ and atomic oxygen $(O)$: $NO_{2(g)} \xrightarrow{h
u} NO_{(g)} + O_{(g)}$.
$2$. The highly reactive atomic oxygen then reacts with molecular oxygen $(O_2)$ in the presence of an inert gas $(M)$ to form ozone $(O_3)$: $O_{(g)} + O_{2(g)} \xrightarrow{M} O_{3(g)}$.

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