A significant portion of industry and transportation burns fossil fuels,such as gasoline.When these fuels burn,chemicals and particulate matter are released into the atmosphere.Although a vast number of substances contribute to air pollution,the most air pollutants contain carbon,sulfur,and nitrogen.These chemicals interact with one another and with ultraviolet radiation in sunlight in dangerous ways.Smog,usually found in urban areas with large numbers of automobiles,forms when nitrogen oxides react with hydro carbons in the air to produce al dehydes and ketones.Smog can cause serious health problems.
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