The chemistry, sources and sinks of atmospheric reactive nitrogen

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There is growing recognition of the looming environmental crisis related to the planetary distribution of reactive nitrogen, and its impacts on environmental issues such as air quality, acid deposition, climate change, agricultural production, and biodiversity. Human activity has dramatically accelerated the rates of nitrogen fixation, leading to tripling of the emission rates of NOx and NH3 since 1860, with a projection of a further doubling by 2050 . Experts propose that the industrial rate of nitrogen fixation should be decreased by a factor of four , but the ability to meet, and rationale for, this ambitious target requires a better understanding of the variables governing the source strength of reactive nitrogen, and the cascade of impacts following emission.