Smog

Smog, a portmanteau of smoke and fog, refers to a type of air pollution that results from the interaction of various pollutants with sunlight. It typically occurs in urban areas with high levels of vehicular emissions, industrial activities, and other combustion processes. Smog can have detrimental effects on human health, the environment, and the economy.

Primarily, there are two types of smog: photochemical smog and sulfurous smog. Photochemical smog forms in the presence of sunlight when _____ ____ _________ _____ ______ ______ _________ ______ _________ ___ ________.
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