Nitrous acid and nitrite in the atmosphere

Why is nitrous acid important as an atmospheric trace gas? It is present in very small quantities, typically up to a few parts in 109 by volume (ppbV), and usually makes up only a small fraction of the total amount of gaseous nitrogen oxides present in the atmosphere. One reason for an increasing number of recent studies into the chemistry of HNO2 is the increasing importance of nitrogen oxides as atmospheric pollutants. Unlike the emissions of sulphur dioxide, which have been decreasing markedly in recent years in Europe and North America, if not in the developing world, the emissions of nitrogen oxides are far from decreasing.

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