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NO x gases are usually produced from the reaction between nitrogen and oxygen during combustion of fuels, such as hydrocarbons, in air; especially at high temperatures, such as in car engines. [1] [2] [3] In areas of high motor vehicle traffic, such as in large cities, the nitrogen oxides emitted can be a significant source of air pollution.
The emissions specifically include SOx, NOx, ODSs and VOCs [2] and the regulations came into effect in May 2005. [3] [4] Annex VI contains provisions for two sets of emission and fuel quality requirements regarding SOx and PM, or NOx, a global requirement and more stringent controls in special emission control areas (ECA). [5]
The term NO x represents several forms of nitrogen oxides such as NO (nitric oxide), NO 2 (nitrogen dioxide) and N 2 O (nitrous oxide, also known as laughing gas).In a gasoline engine, NO is the most common form of NO x at around 93%, while NO 2 is around 5% and the rest is N 2 O.
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As the article says, NOx refers to NO and NO2 -- notice this doesn't include N2O. This definition follows the scientific and engineering literature which distinguishes between NOx and N2O, e.g., this article amongst many. So it's consistent to say that NO and NO2 (i.e., NOx) have a cooling effect while N2O (i.e., not-NOx) has a warming effect.
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It was implemented in two stages, with Stage I implemented in 1999 and Stage II implemented between 2001 and 2004. In 2004, the European Parliament adopted Stage III/IV standards. The Stage III standards were further divided into Stage III A and III B, and were phased in between 2006 and 2013. Stage IV standards are enforced from 2014.
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