Allen, A. G. [UNESP]Machado, C. M. D.Cardoso, Arnaldo Alves [UNESP]2015-05-152015-05-152011Environmental Pollution, v. 159, n. 5, p. 1190-1197, 2011.0269-7491http://hdl.handle.net/11449/123512Increased reactive nitrogen (Nr) deposition due to expansion of agro-industry was investigated considering emission sources, atmospheric transport and chemical reactions. Measurements of the main inorganic nitrogen species (NO2, NH3, HNO3, and aerosol nitrate and ammonium) were made over a period of one year at six sites distributed across an area of ∼130,000 km2 in southeast Brazil. Oxidized species were estimated to account for ∼90% of dry deposited Nr, due to the region’s large emissions of nitrogen oxides from biomass burning and road transport. NO2-N was important closer to urban areas, however overall HNO3-N represented the largest component of dry deposited Nr. A simple mathematical modeling procedure was developed to enable estimates of total Nr dry deposition to be made from knowledge of NO2concentrations. The technique, whose accuracy here ranged from <1% to 29%, provides a useful new tool for the mapping of reactive nitrogen deposition1190-1197engReactive nitrogenDry depositionNitric acidNitrogen dioxideAgricultureArtigo10.1016/j.envpol.2011.02.002Acesso aberto91651098404148376320037184956604