Saumya Singh*, Anshu Sharma* and U.C. Kulshrestha*
*School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067 INDIA
Atmospheric emissions of reactive nitrogen (Nr) species namely NH3 and NOx are at high levels in India in recent years, but only a few studies have employed N deposition monitoring for wet and dry depositions together to evaluate total N deposition. In the present study, gaseous N pollutants (NH3 and NO2) and related ionic species (NH4+, NO3–) were determined in water-soluble fine particulates and rainwater at an agricultural site in the Indo-Gangetic Plain (IGP) during Monsoon season (July-Sept,2013) with the aim of estimate the relative contribution of respective species to total N deposition. The NH3 and NO2 levels were recorded as 30.41µg/m3 and 4.0 ±2.3 µg/m3. Aerosol NH4+ and NO3–concentrations were measured at 0.37 µg/m3 and 1.43 µg/m3 whereas NH4+ and NO3– concentrations in rain water were 25.4 and 12.43 µeq/L. These values are at a relatively higher scale which might be due to high fertilizer use and biomass burning.Calculations of deposition fluxes and neutralization of acid indexes have also been made in order to evaluate the role of Nr species in the atmosphere.