Nitrogen Oxides
Nitrogen Oxides
Nitrogen oxides, or NOx, is the generic term for a group of highly reactive gases, all of which contain nitrogen and oxygen in varying amounts. Many of the nitrogen oxides are colorless and odorless. However, one common pollutant, nitrogen dioxide (NO2) along with particles in the air can often be seen as a reddish-brown layer over many urban areas.
- NOx Emission Sources - Summarizes nitrogen oxides emissions by source at national, state and local levels.
- NOx: How nitrogen oxides affect the way we live and breathe (PDF, 774K, pp. 4, about PDF)
Published by the US EPA
Office of Air Quality Planning & Standards
September 1998