ABSTRACT

A novel infectious coronavirus disease (COVID-19) identified in late 2019 has now been labelled as a global pandemic by World Health Organization (WHO). The COVID-19 outbreak has shown some positive impacts on the natural environment. In present work, India is taken as a case study to evaluate the effect of lockdown on air quality of three Indian cities. The variation in concentration of key air pollutants including $P{M}_{10}$, $P{M}_{2.5}$, $N{O}_2$, $S{O}_2$ and $O_3$ during two phases, pre-lockdown and post-lockdown phases, was analysed. The concentration of $P{M}_{10}$, $P{M}_{2.5}$, $N{O}_2$ and $S{O}_2$ reduced by 55%, 49%, 60% and 19%, and 44%, 37%, 78% and 39% for Delhi and Mumbai, respectively, during post-lockdown phase. Overall, the findings in present study may provide confidence to the stakeholders involved in air quality policy development that a significant improvement in air quality can be achieved in future if better pollution control plans are strictly executed.

摘要

2019 年底发现的一种新型传染性冠状病毒病 (COVID-19) 现已被世界卫生组织 (WHO) 标记为全球大流行病。COVID-19 疫情对自然环境产生了一些积极影响。在目前的工作中，以印度为例，评估封锁对印度三个城市空气质量的影响。主要空气污染物浓度的变化包括$磷{米}_{10}$, $磷{米}_{2.5}$, $ñ{○}_2$, $\mathrm{小号}{○}_2$ 和 ${○}_3$在锁定前和锁定后两个阶段进行了分析。的浓度$磷{米}_{10}$, $磷{米}_{2.5}$, $ñ{○}_2$ 和 $\mathrm{小号}{○}_2$在封锁后阶段，德里和孟买分别减少了 55%、49%、60% 和 19%，以及 44%、37%、78% 和 39%。总体而言，本研究的结果可以让参与空气质量政策制定的利益相关者相信，如果严格执行更好的污染控制计划，未来可以显着改善空气质量。