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Natural Gas

Underground deposits of gases consisting of 50% to 90% methane (CH4) and small amounts of heavier gaseous hydrocarbon compounds such as propane (C3H8) and butane (C4H10).

Nitrogen Oxides (NOx)

Gases consisting of one molecule of nitrogen and varying numbers of oxygen molecules. Nitrogen oxides are produced from the emissions of vehicle exhausts and power stations. Considered pollutants, nitrogen oxides in the atmosphere can contribute to the formation of photochemical ozone, (smog), impair visibility and cause health consequences. 

Nitrous Oxide (N2O)

A powerful greenhouse gas with a global warming potential (GWP) of 298 times that of carbon dioxide. Major sources of nitrous oxide include soil cultivation practices (especially the use of commercial and organic fertilizers), fossil fuel combustion, nitric acid production and biomass burning.