School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou, 730070, China.
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China.
Environ Sci Pollut Res Int. 2022 Mar;29(13):18923-18931. doi: 10.1007/s11356-021-17140-y. Epub 2021 Oct 27.
Nitrogen dioxide (NO) is one of the main air pollutants, formed due to both natural and anthropogenic processes, which has a significant negative impact on human health. The COVID-19 pandemic has prompted countries to take various measures, including social distancing or stay-at-home orders. This study analyzes the impact of COVID-19 lockdown measures on nitrogen dioxide (NO) changes in Central Asian countries. Data from TROPOspheric Monitoring Instrument (TROPOMI) on the Sentinel-5 Precursor satellite, as well as meteorological data, make it possible to assess changes in NO concentration in countries and major cities in the region. In particular, the obtained satellite data show a decreased tropospheric column of NO. Its decrease during the lockdown (March 19-April 14) ranged from - 5.1% (Tajikistan) to - 11.6% (Turkmenistan). Based on the obtained results, it can be concluded that limitations in anthropogenic activities have led to improvements in air quality. The possible influence of meteorology is not assessed in this study, and the implied uncertainties cannot be quantified. In this way, the level of air pollution is expected to decrease as long as partial or complete lockdown continues.
二氧化氮（NO）是主要空气污染物之一，其形成源于自然和人为过程，对人类健康具有重大负面影响。新冠疫情促使各国采取了包括社交距离或居家令在内的各种措施。本研究分析了新冠疫情封锁措施对中亚国家二氧化氮（NO）变化的影响。TROPOspheric Monitoring Instrument（TROPOMI）在 Sentinel-5 前哨卫星上的数据以及气象数据可用于评估该地区各国和主要城市 NO 浓度的变化。特别是，获得的卫星数据显示对流层柱 NO 的减少。封锁期间（3 月 19 日至 4 月 14 日），其减少范围从-5.1%（塔吉克斯坦）至-11.6%（土库曼斯坦）。根据获得的结果可以得出结论，人为活动的限制导致空气质量得到改善。本研究未评估气象的可能影响，也无法量化隐含的不确定性。只要部分或完全封锁持续，预计空气污染水平将降低。
