Assessment of emission reduction effect in Beijing, Tianjin and surrounding 26 cities from January to March in 2020 during the epidemic of COVID-19
ZHU Yuan-yuan1,2, WANG Wei1, GAO Yu-xiao1, CHU Cheng-jun3, XU Rong1, LU Ning1
1. China National Environmental Monitoring Centre, Beijing 100012, China; 2. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3. Chinese Academy of Environmental Planning, Ministry of Ecology and Environment, Beijing 100012, China
Abstract:In order to evaluate the effect of air pollutions emission reduction in Beijing, Tianjin, Hebei and its surrounding 26 cities ("2 + 26" cities) from January to March in 2020 during the epidemic of COVID-19, the air quality model of nested air quality prediction modeling system (NAQPMS) was applied to conduct a few scenarios. The characteristics of air quality from January to March 2020, and during the periods before and after the epidemic of COVID-19 were investigated. The influences of meteorology, emergency emission reduction measures and social economic activities on ambient air quality as well as the uncertainties were elucidated and discussed. The results showed that the number of days achieving good and moderate air quality standard in "2+26" cities accounted for 59.6%, on average of 10.9% increase relative to the same period last year. The mean concentration of PM10、PM2.5、SO2、NO2、O3-8h-90 per and CO-95 per in "2 + 26" cities from January to March in 2020 were 108, 76, 14, 109, 36μg/m3, and 2.3mg/m3, respectively. During the epidemic period from January 24 to March 31, the concentrations of PM10, NO2, PM2.5, and CO decreased significantly compared with the period prior to the epidemic from January 1to 23. In contrast to January to March in 2019, the PM2.5 concentrations of the cities along the Yan mountain and Taihang mountain increased by 1%~8% in 2020. However, the model simulations revealed that the emergency emission reduction measures potentially avoided twice of the regional heavy air pollution events, resulting in the quarterly mean PM2.5 concentration in "2 + 26" cities reduced by 6 to 26μg/m3. Due to the influence of the Spring Festival holiday and epidemic, the traffic emissions were reduced substantially. In contrast, the emissions from the industry such as coking and thermal power did not show large variations, and the negative impact of loose coal combustion on ambient air quality may become even more severe.
朱媛媛, 汪巍, 高愈霄, 储成君, 许荣, 鲁宁. 疫情期间“2+26”城市污染减排成效评估[J]. 中国环境科学, 2021, 41(2): 505-516.
ZHU Yuan-yuan, WANG Wei, GAO Yu-xiao, CHU Cheng-jun, XU Rong, LU Ning. Assessment of emission reduction effect in Beijing, Tianjin and surrounding 26 cities from January to March in 2020 during the epidemic of COVID-19. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 505-516.
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