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All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.

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NO2

Also: Nitrogen dioxide, nitrogen dioxide

Nitrogen dioxide (NO₂)

NO₂ is a pollutant released mainly by fossil fuel combustion.

NO₂ harms air quality by causing respiratory problems and smog. It is also a greenhouse gas, contributing 6% of the human-caused greenhouse effect according to the AGGI.