The present paper designed to understand the variations in the atmospheric pollutants viz. PM₁₀, PM_2.5, SO₂, NO₂, and CO during the COVID-19 pandemic over eight most polluted Indian cities (Mumbai, Delhi, Bangalore, Hyderabad, Lucknow, Chandigarh, Kolkata, and Ahmedabad). A significant reduction in the PM_2.5 (63%), PM₁₀ (56%), NO₂ (50%), SO₂ (9%), and CO (59%) were observed over Major Dhyan Chand Stadium. At Chhatrapati Shivaji International Airport, a decline of 44% in PM_2.5 and 50% in PM₁₀ was seen just a week during the initial phase of the lockdown. Gaseous pollutants (NO₂, SO₂ & CO) dropped up-to 36, 16, and 41%, respectively. The Air Quality Index (AQI) shows a dramatic change from 7% to 67% during observation at Chandigarh and Ballygunge during the inspection. Whereas, Ahmedabad, Worli, Income Tax Office, Talkatora, Lalbagh, and Ballygaunge have showed a significant change in AQI from 25.76% to 68.55%. However, Zoo Park, CST, Central School, and Victoria show relatively low variation in AQI in the range of 3.0% to 14.50% as compare to 2019 after lockdown. Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) analysis suggested that long range transportation of pollutants were also a part and parcel contributing to changes in AQI which were majorly coming from the regions of Iran, Afghanistan, Saudi Arabia, as well as a regional grant from Indian Gangatic plains and Delhi Non-capital region.

本论文旨在了解大气污染物的变化，即。在印度八个污染最严重的城市（孟买、德里、班加罗尔、海得拉巴、勒克瑙、昌迪加尔、加尔各答和艾哈迈达巴德）发生 COVID-19 大流行期间，PM ₁₀、PM _2.5、SO ₂、NO _{2和 CO。}在主要 Dhyan Chand 体育场观察到PM _2.5 (63%)、PM ₁₀ (56%)、NO ₂ (50%)、SO _{2 (9%) 和 CO (59%) 显着减少。}在贾特拉帕蒂·希瓦吉国际机场，在封锁的最初阶段仅一周时间，PM _{2.5和 PM 10}分别下降了 44%和 50% 。气态污染物（NO_{2 、}二氧化硫& CO) 分别下降了 36%、16% 和 41%。检查期间在昌迪加尔和巴利冈吉的观察期间，空气质量指数 (AQI) 显示出从 7% 到 67% 的巨大变化。鉴于艾哈迈达巴德、Worli、所得税办公室、Talkatora、Lalbagh 和 Ballygaunge 的 AQI 从 25.76% 显着变化至 68.55%。然而，与锁定后的 2019 年相比，动物园公园、CST、中央学校和维多利亚的 AQI 变化相对较小，在 3.0% 至 14.50% 的范围内。混合单粒子拉格朗日综合轨迹 (HYSPLIT) 分析表明，污染物的长距离传输也是导致 AQI 变化的重要组成部分，这些变化主要来自伊朗、阿富汗、沙特阿拉伯等地区，以及区域拨款来自印度恒河平原和德里非首都地区。