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Nitrogen deposition in the greater Tehran metropolitan area
A Salahi1, S Geranfar, S A Korori
1Research Institute of Forests and Rangelands, Alborz Research Center, Karaj, Iran. ali.salahi@rifr-ac.org
Thescientificworldjournal
|June 14, 2003
Summary
Tehran
Area of Science:
- Environmental Science
- Atmospheric Chemistry
Background:
- Air pollution in urban areas poses significant environmental and health risks.
- Nitrate (NO3-) and ammonia (NH3) are key components of atmospheric deposition.
Purpose of the Study:
- To investigate the levels and patterns of wet deposition of nitrate and ammonia in the Tehran metropolitan area and a nearby parkland.
- To compare seasonal variations in nitrate wet deposition.
Main Methods:
- Analysis of wet deposition samples collected between 1992-2000.
- Quantification of nitrate ion (NO3-) and ammonia (NH3) concentrations.
Main Results:
- Wet deposition of nitrate in Tehran was over 30 kg/ha/year, significantly higher than in Chitgar Parkland (13 kg/ha/year).
- Nitrate deposition was twofold higher in warm seasons compared to cold seasons.
- Annual wet deposition of ammonia was 10 kg/ha/year in Chitgar Parkland.
Conclusions:
- The Tehran metropolitan area experiences high levels of nitrate wet deposition, indicating significant air pollution.
- Seasonal variations in nitrate deposition are pronounced, with higher amounts during warmer months.
- Ammonia deposition also contributes to the atmospheric chemistry in the region.