The products resulting from atmospheric reactions of hydrocarbons and nitrogen oxides in the presence of sunlight are called:
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Photochemical smog is a brownish-grey haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen. ... Photochemical smog appears to be initiated by nitrogen oxides that are emitted into the air as pollutants mainly from internal combustion engines.
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