NOx

Nitrogen oxide, or NOx, is a generic term referring to mono-nitrogen oxides NO and NO2 (nitric oxide and nitrogen dioxide). These gases are emitted during high temperature fuel combustion in motor vehicles, electric utilities and other industrial or residential sources. Following the Seveso incident and the consequent European legislation of the 1980s, European refiners have started implementing strict measures to reduce the impact of NOx emissions and other volatile compounds.