The Nitrogen oxide reference article from the English Wikipedia on 24-Apr-2004
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Nitrogen oxide

For people who check facts
Nitrogen has five different oxides:

The term nitrogen oxide is imprecise and can be used to refer to any of these or to a mixture of them. A mixture is often formed in chemical reactions that produce nitrogen oxides, with the proportions depending on the specific reaction and the conditions it is performed in.

See the articles for these oxides for details on their properties, as well as NOx.