Photochemical smog is caused by a light mediated reaction between

N O_{2}

and unsaturated hydrocarbons

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N O_{2}

and

O_{3}

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S O_{2}

and unburnt hydrocarbons

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S O_{2}

and

O_{2}

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Solution

The correct option is B $N O_{2}$ and unsaturated hydrocarbons
The type of air pollution caused by photochemical smog is formed through the reaction of solar radiation with airborne pollutants like nitrogen oxides and volatile organic compounds. These compounds, which are called as primary pollutants, are often introduced into the atmosphere through automobile emissions and industrial processes. Ultraviolet light can split nitrogen dioxide into nitric oxide and monatomic oxygen, this monatomic oxygen can then react with oxygen gas to form ozone. Products like ozone, aldehydes, and peroxyacetyl nitrates are called as secondary pollutants. The mixture of these primary and secondary pollutants forms photochemical smog. Thus, the correct answer is option A.

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