Nr的空前增长引起了水体富营养化、臭氧损耗和气候变化等环境问题。过量的天然橡胶还会导致植物和人类健康不良、土壤酸化、地下水污染等。占世界人口四分之一的南亚地区只占全球陆地面积的4.9%，却消耗了全球60%的化肥养分。印度是南亚最大的合成肥料消费国。据估计，印度每年消耗约1700万吨Nr，使南亚和印度成为N种沉积的热点地区。在印度，1950-51年至2013-14年氮肥用量增加了314倍。1951-52年每公顷氮耗量为0.44 kgha^-1， 2013-14年为86.2 kgha^-1。由于雨季只有几个月，大部分时间天气炎热干燥。因此，干沉降是该地区污染物去除的关键机制。湿沉积主要发生在季风期。 The wet deposition of NH₃-N observed to be the highest in the Indo-Gangetic plains. The annual NO₃-N deposition at the urban, suburban, rural and industrial site found to be 4.48, 2.10, 4.06 and 3.92 kgha^-1 respectively, and the annual deposition of NH₄-N at the urban, suburban, rural and industrial site found to be 2.38, 2.10, 2.38 and 5.05 kgha^-1 respectively. The average total wet deposition of NO₃-N and NH₄-N in India is estimated to be 6.01kgha^-1 which is equivalent to 1.97 Tg N/yr_. The average total dry deposition of NH₄-N and NO₃-N through dust fall found to be 0.37 kg ha^-1 and 0.84 kg ha^-1 respectively. The average total dry deposition of NH₄-N and NO₃-N in the form of aerosols found to be 0.28 and 1.65 kg ha^-1 while through gaseous dry deposition it was 4.72 kg ha^-1 and 0.28 kg ha^-1 for NH₄-N and NO₃-N respectively. This study highlights the need for integrated nitrogen monitoring and assessment in South Asia.