Nitrogen Oxides

The term nitrogen oxide is used to refer to any of these oxygen compounds of nitrogen, or to a mixture of them:Nitric oxide (NO), nitrogen(II) oxideNitrogen dioxide (NO2), nitrogen(IV) oxideNitrous oxide (N2O)Dinitrogen trioxide (N2O3), nitrogen(II, IV) oxideDinitrogen tetroxide (N2O4), nitrogen(IV) oxideDinitrogen pentoxide (N2O5), nitrogen(V) oxide (Note that the last three are unstable.)
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A product of combustion of fossil fuels whose production increases with the temperature of the process. It can become an air pollutant if concentrations are excessive. (DOE6)

Gases consisting of one molecule of nitrogen and varying numbers of oxygen molecules. Nitrogen oxides are produced, for example, by the combustion of fossil fuels in vehicles and electric power plants. In the atmosphere, nitrogen oxides can contribute to formation of photochemical ozone (smog), impair visibility, and have health consequences; they are considered pollutants.

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