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I guess you mean N2O, not NOx...
Nitrous oxide - Wikipedia, the free encyclopedia
Nitrous oxide reacts with ozone in the stratosphere. Nitrous oxide is the main naturally occurring regulator of stratospheric ozone. Nitrous oxide is a major greenhouse gas. Considered over a 100 year period, it has 298 times more impact per unit weight than carbon dioxide. Thus, despite its low concentration, nitrous oxide is the fourth largest contributor to these greenhouse gases. It ranks behind carbon dioxide, methane, and water vapor, the latter of which comprises greater than 95% of all greenhouse gases. Control of nitrous oxide is part of efforts to curb greenhouse gas emissions.

NOx is nasty stuff, contributes to smog and acid rain, but not a greenhouse gas.
by nanne (zwaerdenmaecker@gmail.com) on Wed Nov 19th, 2008 at 05:09:07 PM EST
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