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Nitrogen oxides, or NOx, is the generic term for a group of highly reactive gases that contain nitrogen and oxygen in varying amounts. Many nitrogen oxides are colorless and odorless, but nitrogen dioxide (NO2), a common pollutant, often can often be seen as a reddish-brown layer over urban areas. The most common man made sources of NOx are motor vehicles, electric utilities and other sources that burn fuels for heating and cooling[1].

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  1. Nitrogen Oxides. U.S. Environmental Protection Agency.