Faculty of Sciences and Environment, The European Centre of Excellence for the Environment, "Dunarea de Jos" University of Galati, Domneasca Street, No. 111, 800201 Galati, Romania.
Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Ringlaan-3-Avenue Circulaire, B-1180 Brussels, Belgium.
Int J Environ Res Public Health. 2021 Jan 11;18(2):544. doi: 10.3390/ijerph18020544.
This study investigates changes in pollution associated with the lockdown period caused by the COVID-19 pandemic in Galati (45.43° N, 28.03° E), a Romanian city located in the southeast of Romania. The study is focused on nitrogen dioxide (NO), a trace gas which can be related to emissions from industrial activities, heating, and transportation. The investigation is based on in situ observations from local Air Quality Monitoring Stations (AQMS) and mobile remote sensing observations by Differential Optical Absorption Spectroscopy (DOAS) technique. We also show results of the NO vertical column measured by TROPOMI (TROPOspheric Monitoring Instrument), a space instrument onboard of satellite mission Sentinel-5P, to complement local ground-based measurements. For in situ observations, the lockdown interval (23 March 2020-15 May 2020) was separated from normal periods. The decrease in local NO concentration during lockdown, measured in situ, is rather small, of about 10-40% at the most, is observed only at some stations, and is better seen during workdays than during weekends. We conclude that the decrease in NO content over Galati city during lockdown is relatively small and may be attributed to the reduction in local traffic, a consequence of special measures and restrictions imposed during the COVID-19 lockdown by the Romanian authorities.
本研究调查了 COVID-19 大流行期间罗马尼亚东南部加拉茨市（45.43°N，28.03°E）封锁期间与污染相关的变化。该研究集中在二氧化氮（NO）上，这是一种痕量气体，可与工业活动、供暖和运输排放有关。该调查基于当地空气质量监测站（AQMS）的现场观测和差分光学吸收光谱（DOAS）技术的移动遥感观测。我们还展示了 TROPOMI（热带监测仪器）测量的 NO 垂直柱的结果，TROPOMI 是卫星任务 Sentinel-5P 上的空间仪器，以补充当地地面测量。对于现场观测，将封锁间隔（2020 年 3 月 23 日至 2020 年 5 月 15 日）与正常时期分开。在某些站点观察到，在工作日比周末期间观察到，在当地测量的 NO 浓度在封锁期间的下降幅度相当小，约为 10-40%，并且仅在某些站点观察到。我们得出的结论是，加拉茨市在封锁期间 NO 含量的下降相对较小，可能归因于罗马尼亚当局在 COVID-19 封锁期间实施的特殊措施和限制导致的当地交通减少。
