United States Department of Transportation
i
Effect of Ozone and Distance from a Major Roadway on Nitrogen Oxides Concentrations
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2011-02-28
[PDF-644.87 KB]
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Abstract:Despite recent advances in the automobile industry in reducing emissions from individual vehicles, air pollution in localities, where there are regional increases in the traffic volumes, still persist at problematic levels. Vehicular emissions are the major contributors to atmospheric NOx constituting about half of all anthropogenic emissions. Most of NO2 and all other nitrogen species are formed in air as a result of the chemical reactions of NO with other pollutants. Therefore, nitrogen oxides play a major role in the atmospheric photochemistry, controlling ozone formation and generation of the hydroxyl (OH) and other reactive radicals. These reactions produce a complex mixture of chemicals, which can further transform into secondary aerosols that increase the particulate matter (PM) content of the ambient air.
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