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The most important trace gases contributing to the greenhouse effect are water vapor, carbon dioxide, ozone, methane, ammonia, nitric acid, nitrous oxide, ethylene, sulfur dioxide, nitric oxide, dichlorofluoromethane or Freon 12, ...
NOx"Abbreviation for various oxides of nitrogen, including NO (nitric oxide), NO2 (nitrogen dioxide), or N2O (nitrous oxide).
A general term pertaining to compounds of nitric oxide (NO), nitrogen dioxide (NO2), and other oxides of nitrogen. Nitrogen oxides are typically created during combustion processes, and are major contributors to smog formation and acid deposition.
Peroxycetyl nitrate (PAN) A pollutant formed from photochemical reactions involving nitric oxide (NO) and hydrocarbons (HC). PAN produces no known human health effect, but it is particularly damaging to plants.
See also: Atmosphere, Temperature, Wind, Oxygen, Clouds
 
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