COVID-19封锁下的新德里大都市空气质量
Air Quality in the New Delhi Metropolis under COVID-19 Lockdown
摘要：
随着世界各大城市工业化程度的提高，空气污染不断加剧。一些国家采取了一些措施，包括严格的气候法律和减少车辆数量。COVID-19疫情为了解日常人类活动对空气污染的影响提供了绝佳机会。大多数国家在很大程度上限制工业活动和车辆交通，作为限制COVID-19传播的措施。在本文中，我们分析了COVID 19引发的封锁对印度新德里市空气质量的影响。我们分析了常见气体污染物二氧化硫（SO $_2$）、臭氧（O $_3$）、二氧化氮（NO $_2$）和一氧化碳（CO）的平均浓度。这些浓度是从Sentinel-5 P（欧洲航天局的地球观测卫星）数据的对流层柱中获得的。我们观察到，由于严格的封锁措施，该市所有主要污染物的大气污染物浓度水平均大幅下降。从地面监测站获得的污染物数据也证实了这一结论。我们观察到，在封锁期之后，近地面污染物浓度显著下降，PM $_{2.5}$下降50%，NO $_2$下降71.9%，CO下降88%。这些研究将为环保人士实施未来的空气污染控制措施铺平道路。
英文摘要：
Air pollution has been on continuous rise with increase in industrialization in metropolitan cities of the world. Several measures including strict climate laws and reduction in the number of vehicles were implemented by several nations. The COVID-19 pandemic provided a great opportunity to understand the daily human activities effect on air pollution. Majority nations restricted industrial activities and vehicular traffic to a large extent as a measure to restrict COVID-19 spread. In this paper, we analyzed the impact of such COVID19-induced lockdown on the air quality of the city of New Delhi, India. We analyzed the average concentration of common gaseous pollutants viz. sulfur dioxide (SO$_2$), ozone (O$_3$), nitrogen dioxide (NO$_2$), and carbon monoxide (CO). These concentrations were obtained from the tropospheric column of Sentinel-5P (an earth observation satellite of European Space Agency) data. We observed that the city observed a significant drop in the level of atmospheric pollutant's concentration for all the major pollutants as a result of strict lockdown measures. Such findings are also validated with pollutant data obtained from ground-based monitoring stations. We observed that near-surface pollutant concentration dropped significantly by 50% for PM$_{2.5}$, 71.9% for NO$_2$, and 88% for CO, after the lockdown period. Such studies would pave the path for implementing future air pollution control measures by environmentalists.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
