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COVID-19 Pandemic and City-Level Nitrogen Dioxide (NO2) Reduction for Urban Centres of India
Journal of the Indian Society of Remote Sensing ( IF 2.5 ) Pub Date : 2020-07-01 , DOI: 10.1007/s12524-020-01130-7
Asfa Siddiqui , Suvankar Halder , Prakash Chauhan , Pramod Kumar

Air pollution poses a grave health risk and is a matter of concern for researchers around the globe. Toxic pollutants like nitrogen dioxide (NO2) is a result of industrial and transport sector emissions and need to be analysed at the current scenario. After the world realised the effect of COVID-19 pandemic, countries around the globe proposed complete lockdown to contain the spread. The present research focuses on analysing the gaseous pollution scenarios, before and during lockdown through satellite (Sentinel-5P data sets) and ground-based measurements (Central Pollution Control Board’s Air Quality Index, AQI) for 8 five-million plus cities in India (Delhi, Ahmedabad, Kolkata, Mumbai, Hyderabad, Chennai, Bengaluru and Pune). The long-term exposure to NO2 was also linked to pandemic-related mortality cases across the country. An average of 46% reduction in average NO2 values and 27% improvement in AQI was observed in the eight cities during the first lockdown phase with respect to pre-lockdown phase. Also, 53% of Corona positive cases and 61% of fatality cases were observed in the eight major cities of the country alone, coinciding with locations having high long-term NO2 exposure.

中文翻译:

印度城市中心的 COVID-19 大流行和城市级二氧化氮 (NO2) 减排

空气污染对健康构成严重威胁,是全球研究人员关注的问题。二氧化氮 (NO2) 等有毒污染物是工业和交通部门排放的结果,需要在当前情景下进行分析。在世界意识到 COVID-19 大流行的影响后,世界各国提议完全封锁以遏制传播。目前的研究重点是通过卫星(Sentinel-5P 数据集)和地面测量(中央污染控制委员会的空气质量指数,AQI)分析印度 8 个 500 万多个城市在封锁之前和期间的气体污染情景(德里、艾哈迈达巴德、加尔各答、孟买、海得拉巴、钦奈、班加罗尔和浦那)。长期接触二氧化氮也与全国各地与大流行相关的死亡病例有关。与锁定前阶段相比,在第一个锁定阶段期间,八个城市的平均二氧化氮值平均降低了 46%,空气质量指数平均提高了 27%。此外,仅在该国八个主要城市中就观察到了 53% 的电晕阳性病例和 61% 的死亡病例,这与长期暴露于二氧化氮的地点相吻合。
更新日期:2020-07-01
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