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 primary pollutants released from automobiles and industries undergo chemical reactions in the presence of sunlight. The major precursors are nitrogen oxides and volatile organic compounds emitted mainly from vehicular exhausts, fuel evaporation, and industrial processes. Under strong sunlight, nitrogen dioxide absorbs ultraviolet radiation and dissociates to form nitric oxide and highly reactive atomic oxygen. This atomic oxygen combines with molecular oxygen to produce ozone at ground level, which is a harmful secondary pollutant. Unlike the protective stratospheric ozone, tropospheric ozone causes irritation to eyes and lungs and
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