Atmospheric deposition of reactive nitrogen species has resulted in major problems such as acidification and eutrophication of near-natural terrestrial and aquatic ecosystems. Nitrogen deposition mainly occurs by sedimentation of nitrate and ammonium N with coarse particles both wet and dry, by dry deposition of nitrate and ammonium in fine particles, as well as by dry deposition of gaseous ammonia (NH3), nitrogen dioxide (NO2), nitrous acid (HONO), and nitric acid (HONO2). The role of organic species such as organic nitrates and amines is uncertain and is still being discussed.1 Much is known about PAN. At least in Europe, the contribution of these species to atmospheric deposition seems to be of minor importance.
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