1. Autos
Send to a Friend via Email
You can opt-out at any time. Please refer to our privacy policy for contact information.

What are Oxides of Nitrogen (NOx)?


Definition: Oxides of Nitrogen are the direct result of combustion in the presence of atmospheric nitrogen and oxygen. Though they are present in the exhaust of any internal combustion engine, they are especially dominant in diesel engine emissions. A function of heat and pressure, NOx numbers skyrocket in the high compression, high temperature confines of a diesel combustion chamber. The EPA regulated portions of NOx are nitric oxide (NO) and nitrogen dioxide (NO2). These are the acidic gases that contribute to smog formation and acid rain.
Pronunciation: ŏk-sīds uhv nahy-truh-juhn
Also Known As: NOx, nitrogen oxides

©2014 About.com. All rights reserved.