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DOI	10.5194/acp-20-15725-2020
	What can we learn about urban air quality with regard to the first outbreak of the COVID-19 pandemic? A case study from central Europe
	Salma I.; Vörösmarty M.; Gyöngyösi A.Z.; Thén W.; Weidinger T.
发表日期	2020
ISSN	1680-7316
起始页码	15725
结束页码	15742
卷号	20 期号:24
英文摘要	Motor vehicle road traffic in central Budapest was reduced by approximately 50 % of its ordinary level for several weeks as a consequence of various limitation measures introduced to mitigate the first outbreak of the COVID-19 pandemic in 2020. The situation was utilised to assess the real potentials of urban traffic on air quality. Concentrations of NO, NO2, CO, O3, SO2 and particulate matter (PM) mass, which are ordinarily monitored in cities for air quality considerations, aerosol particle number size distributions, which are not rarely measured continuously on longer runs for research purposes, and meteorological properties usually available were collected and jointly evaluated in different pandemic phases. The largest changes occurred over the severest limitations (partial lockdown in the Restriction phase from 28 March to 17 May 2020). Concentrations of NO, NO2, CO, total particle number (N6 1000) and particles with a diameter < 100 nm declined by 68 %, 46 %, 27 %, 24 % and 28 %, respectively, in 2020 with respect to the average reference year comprising 2017 2019. Their quantification was based on both relative difference and standardised anomaly. The change rates expressed as relative concentration difference due to relative reduction in traffic intensity for NO, NO2, N6 1000 and CO were 0.63, 0.57, 0.40 and 0.22 (%/%), respectively. Of the pollutants which reacted in a sensitive manner to the change in vehicle circulation, it is the NO2 that shows the most frequent exceedance of the health limits. Intentional tranquillising of the vehicle flow has considerable potential for improving the air quality. At the same time, the concentration levels of PM10 mass, which is the most critical pollutant in many European cities including Budapest, did not seem to be largely affected by vehicles. Concentrations of O3 concurrently showed an increasing tendency with lower traffic, which was explained by its complex reaction mechanism. Modelling calculations indicated that spatial gradients of NO and NO2 within the city became further enhanced by reduced vehicle flow. © 2020 Author(s).
英文关键词	aerosol; air quality; concentration (composition); COVID-19; disease transmission; particle size; particulate matter; road traffic; urban area; viral disease; Budapest; Hungary
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168878
作者单位	Institute of Chemistry, Eötvös University, Budapest, Hungary; Hevesy György PhD School of Chemistry, Eötvös University, Budapest, Hungary; Department of Meteorology, Eötvös University, Budapest, Hungary
推荐引用方式 GB/T 7714	Salma I.,Vörösmarty M.,Gyöngyösi A.Z.,et al. What can we learn about urban air quality with regard to the first outbreak of the COVID-19 pandemic? A case study from central Europe[J],2020,20(24).
APA	Salma I.,Vörösmarty M.,Gyöngyösi A.Z.,Thén W.,&Weidinger T..(2020).What can we learn about urban air quality with regard to the first outbreak of the COVID-19 pandemic? A case study from central Europe.Atmospheric Chemistry and Physics,20(24).
MLA	Salma I.,et al."What can we learn about urban air quality with regard to the first outbreak of the COVID-19 pandemic? A case study from central Europe".Atmospheric Chemistry and Physics 20.24(2020).