PM_2.5 pollution in India increases severely during the winter season due to adverse meteorological conditions and shows comparatively higher pollution loading in Indo-Gangetic Plain (IGP). However, investigation of the role of major sources and different states of IGP in local and regional higher PM_2.5 pollution for effective formulation of mitigation policies has been limited. In this study, the Weather Research and Forecasting model coupled with chemistry (WRF-Chem v 3.9.1) was used to quantify the contribution of emissions from major source sectors and source regions of IGP to local and regional PM_2.5 pollution during winter. The short-term premature mortality and its apportionment has also been estimated. Contributions from seven source states of the IGP to local and regional PM_2.5 pollution at eight major cities of the IGP have been investigated. The residential and transport sector emerge as leading contributors with ~40–50% share in ambient PM_2.5 pollution over IGP, whereas the contributions of the industrial (~5–20%) and energy sectors (~5–40%) varies significantly across the IGP. While the contributions of local sources were found to dominate in all IGP states, significant contributions were also seen from neighboring IGP states. At megacity Delhi, significant contribution in local PM_2.5 pollution was observed by transportation (~49%) and energy (~24%) sectors, and at Kolkata, it was from residential (~48%) and industrial (~24%) sectors. January 2016 mean short-term premature mortality estimates for Delhi and Kolkata are found 61(33–91) and 44(23–64) persons/day, respectively, with local sources contributions of 40(21–58) and 29(15–42) persons/day, respectively.

由于不利的气象条件，印度的PM _2.5污染在冬季急剧增加，并显示出印度恒河平原（IGP）相对较高的污染负荷。但是，对于IGP的主要来源和不同状态在地方和区域较高的PM _2.5污染中对有效制定缓解政策的作用的研究是有限的。在这项研究中，天气研究和预报模型与化学（WRF-Chem v 3.9.1）相结合，用于量化IGP主要排放源部门和排放源区域对本地和区域PM _2.5的排放贡献。冬季污染。还估计了短期过早死亡率及其分配。研究了IGP的七个来源国对IG​​P八个主要城市本地和区域PM _2.5污染的贡献。住宅和交通运输业是主要的贡献者，在IGP的环境PM _2.5污染中所占份额约为40-50％，而工业（约5-20％）和能源部门（约5-40％）的贡献在整个IGP中差异很大IGP。虽然在所有IGP州中都发现了本地资源的贡献，但在邻近的IGP州中也发现了重要的贡献。在德里大城市，当地PM _2.5发挥了重要作用在运输业（〜49％）和能源业（〜24％）部门观察到了污染，在加尔各答，污染来自住宅部门（〜48％）和工业部门（〜24％）。2016年1月，德里和加尔各答的平均短期过早死亡估计分别为每天61（33-91）和44（23-64）人/天，当地来源贡献为40（21-58）和29（15-15）。 42）人/天。