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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. ______ _______ ________ __________ _________ ____ _____ ______.
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