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Where does NOx come from?

April 26, 2017nox

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Where does NOx come from?

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Natural sources of nitrogen oxides (NOx) include volcanoes, lightening strikes and biological decay. Estimates range from between 20 million and 90 million tons per year NOx released from natural sources, compared to around 24 million tons from human sources world-wide. Nitrogen oxides are produced when fossil fuels are burned. The major sources of NOx in the UK in 1999 were road transport (44%), power stations (21%) and industry (including iron and steel, and refineries) (12%).