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Nitrogen oxide

From Wikipedia, the free encyclopedia

Nitrogen oxide may refer to a binary compound of oxygen and nitrogen, or a mixture of such compounds:




Name Formula
Nitroxide O=N or NO
Nitrite O=N−O or NO2
Nitrate O2N−O or NO3
Peroxynitrite O=N−O−O or NO3
Peroxynitrate O2N−O−O or NO4
Orthonitrate +N(−O)4 or NO3−4
Hyponitrite O−N=N−O or N2O2−2
Trioxodinitrate or hyponitrate O=N−N(−O)2 or N2O2−3
Nitroxylate (O−)2N−N(−O)2 or N2O4−4
Dinitramide O2N−N−NO2 or N3O4



Atmospheric sciences


In atmospheric chemistry:

  • NOx (or NOx) refers to the sum of NO and NO2.[1][2]
  • NOy (or NOy) refers to the sum of NOx and all oxidized atmospheric odd-nitrogen species (e.g. the sum of NOx, HNO3, HNO2, etc.)
  • NOz (or NOz) = NOyNOx



Due to relatively weak N–O bonding, all nitrogen oxides are unstable with respect to N2 and O2, which is the principle behind the catalytic converter, and prevents the oxygen and nitrogen in the atmosphere from combusting.

See also



  1. ^ United States Clean Air Act, 42 U.S.C. § 7602
  2. ^ Seinfeld, John H.; Pandis, Spyros N. (1997), Atmospheric Chemistry and Physics: From Air Pollution to Climate Change, Wiley-Interscience, ISBN 0-471-17816-0