Emissions of NOx, NH3 and N2O from anthropogenic activities in India h
ave been estimated based on actual field measurements as well as avail
able default methodologies. The NOx emissions are mainly from the tran
sport sector and contribute about 5% of the global NOx emission from f
ossil fuel. NH3 emissions from urea seems to be highly uncertain. Howe
ver, emissions of NH3 from fertilizers and livestock are estimated to
be 1175 Gg and 1433 Gg, respectively. N2O emissions seem to be derived
predominantly from fertilizer applications, resulting in the release
of 199-279 Gg N2O. Other sources of N2O, viz. agricultural residue bur
ning, biomass burning for energy and nitric acid production are estima
ted to be 3, 35-187 and 2-7 Gg, respectively.