School of Economics and Management, Southeast University, Nanjing, China.
School of International Trade and Economics, University of International Business and Economics, Beijing, China.
Environ Res. 2021 Jun;197:111052. doi: 10.1016/j.envres.2021.111052. Epub 2021 Mar 19.
The current coronavirus (COVID-19) pandemic has a high spreading and fatality rate. To control the rapid spreading of the COVID-19 virus, the government of India imposed lockdown policies, which creates a unique opportunity to analyze the impact of lockdown on air quality in the two most populous cities of India, i.e., Delhi and Mumbai. To do this, the study employed a spatial approach to examine the concentration of seven criteria pollutants, i.e., PM, PM, NH, CO, NO, O, and SO before, during, and after a lockdown in Delhi and Mumbai. Overall, around 42%, 50%, 21%, 37%, 53%, and 41% declines in PM, PM, NH, CO, NO, and SO were observed during the lockdown period as compared to previous years. On the other hand, a 2% increase in O concentration was observed. However, the study analyzed the National Air Quality Index (NAQI) for Delhi and Mumbai and found that lockdown does not improve the air quality in the long term period. Our key findings provide essential information to the cities' administration to develop rules and regulations to enhance air quality.
当前的冠状病毒（COVID-19）大流行具有很高的传播率和死亡率。为了控制 COVID-19 病毒的快速传播，印度政府实施了封锁政策，这为分析封锁对印度两个人口最多的城市（即德里和孟买）的空气质量的影响提供了独特的机会。为此，该研究采用空间方法，检查了德里和孟买封锁前后七种标准污染物（即 PM、PM、NH、CO、NO、O 和 SO）的浓度。总体而言，与前几年相比，封锁期间 PM、PM、NH、CO、NO 和 SO 的浓度分别下降了约 42%、50%、21%、37%、53%和 41%。另一方面，O 浓度增加了 2%。然而，该研究分析了德里和孟买的国家空气质量指数（NAQI），发现封锁并不能长期改善空气质量。我们的主要发现为城市管理部门提供了必要的信息，以制定规则和法规来提高空气质量。
