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Oxides of Nitrogen
When photochemical reactions of nitric oxide occur in ambient air, the result is nitrogen oxides. Nitrogen oxides are one of the major components of photochemical smog. A product of combustion from transportation and stationary sources, these oxides are a major contributor to the formation of ozone in the troposphere and to acid deposition.
NOx is primarily formed as the result of fossil fuel combustion from power plants, cars, and trucks.