Question
Explain the formation of photochemical smog using a suitable diagram.
Answer :
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Photochemical smog is a type of air pollution formed when sunlight interacts with certain pollutants in the atmosphere, primarily nitrogen oxides (NO and NO₂) and volatile organic compounds (VOCs) emitted from vehicles, industrial activities, and other combustion processes. The formation of photochemical smog is a series of complex photochemical reactions driven by solar radiation. The process begins with the emission of nitrogen oxides (NOx) and VOCs into the atmosphere. Under the influence of ultraviolet (UV) sunlight, nitrogen dioxide (NO₂) undergoes photolysis, splitting into nitric oxide (NO) and a highly reactive oxygen atom (O). This oxygen atom reacts with molecular oxygen (O₂) to form ozone (O₃),
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