Pandey Mayank, George M P, Gupta R K, Gusain Deepak, Dwivedi Atul
Department of Environmental Studies, P.G.D.A.V. College (Evening), University of Delhi, Ring Road, Nehru Nagar, Delhi 110065, India.
Air Laboratory Delhi Pollution Control Committee Fourth Floor, ISBT Building, Kashmere Gate, Delhi 110006, India.
Urban Clim. 2021 Sep;39:100945. doi: 10.1016/j.uclim.2021.100945. Epub 2021 Aug 5.
The present study deals with the impact of the pandemic outbreak of COVID-19 on the ambient air quality in the capital city of India. Real-time data were collected from eight continuous ambient air quality monitoring stations measuring important air quality parameters (NO, PM and PM). Results revealed that the city's air quality had improved significantly during the lockdown period due to COVID-19 outbreak. The concentration of gaseous and particulate matter during the lockdown period (March-May 2020) declined significantly compared with the preceding years' data from the same timeframe. However, the ambient air quality deteriorates with the onset of unlocking phases and post-monsoon season (October 2020). Higher concentration of NO, PM and PM were recorded at industrial (S1 and S2) and hotspot (S4 and S5) sites. The lowest concentrations of studied pollutants were observed during the first phase of lockdown (March 24 - May 14, 2020). The present study, once again, establishes the direct effect of anthropogenic activities and deteriorating ambient air quality of Delhi.
本研究探讨了新冠疫情爆发对印度首都城市空气质量的影响。从八个连续的环境空气质量监测站收集了测量重要空气质量参数（一氧化氮、细颗粒物和可吸入颗粒物）的实时数据。结果显示，由于新冠疫情爆发，在封锁期间该城市的空气质量有了显著改善。与前几年同一时间段的数据相比，封锁期间（2020年3月至5月）气态和颗粒物的浓度显著下降。然而，随着解封阶段和季风后季节（2020年10月）的到来，环境空气质量恶化。在工业（S1和S2）和热点地区（S4和S5）站点记录到较高浓度的一氧化氮、细颗粒物和可吸入颗粒物。在封锁的第一阶段（2020年3月24日至5月14日）观察到所研究污染物的最低浓度。本研究再次证实了人为活动与德里环境空气质量恶化之间的直接关联。
