Explain how photochemical smog forms

Recognize that atmospheric nitrogen oxides, NO and NO₂, react with unburned hydrocarbons to form peroxyacetyl nitrate (PAN), a component of photochemical smog.

As the syllabus states it

Recognize that atmospheric oxides of nitrogen( NO and $\mathrm{NO}_{2}$ ) can react with unburned hydrocarbons to form peroxyacetyl nitrate, PAN, which is a component of photochemical smog.

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