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Volume 1 (2001), Pages 261-265
Research Article

Nitrogen Deposition in the Greater Tehran Metropolitan Area

Research Institute of Forests and Rangelands, Alborz Research Center, Karaj, Iran

Academic Editor: Joe Wisniewski

Copyright © 2001 Ali Salahi et al.


An investigation of air pollution in the Tehran metropolitan area between 1992–2000 indicated that there are significant amounts of nitrate ion (NO3), over 30 kg/ha/year, deposited as wet deposition, compared to 13 kg/ha/year in the Chitgar Parkland near the Tehran metropolitan area. The amount of NO3 in warm seasons is twofold that of cold seasons (see Fig. 1), and there was a significant difference between cold and warm seasons (Table 1). Annual wet deposition of ammonia (NH3) was 10 kg/ha/year in the Chitgar Parkland[1].