Characteristics of PM2.5 Pollution and the Efficiency of Concentration Control During a Red Alert in the Beijing-Tianjin-Hebei Region, 2016

被引：6

作者：

Zhang C. ^{[1
]}

Lang J.-L. ^{[1
]}

Cheng S.-Y. ^{[1
]}

Wang X.-Q. ^{[1
]}

机构：

[1] Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing

来源：

Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 08期

关键词：

BTH region; Effect assessment; Heavy pollution; PM[!sub]2.5[!/sub; Red alert;

D O I：

10.13227/j.hjkx.201811155

中图分类号：

学科分类号：

摘要：

The Beijing-Tianjin-Hebei (BTH) region experienced a heavy pollution episode in December 2016. Beijing and Tianjin issued a red alert from 20:00 December 16 to 24:00 December 21, while every city in Hebei Province (except Zhangjiakou, Chengde, and Qinhuangdao) issued a red alert from 00:00 December 16 to 18:00 December 22. In order to study the process of heavy pollution and the effect of implementing emergency measures, pollutant concentrations, meteorological conditions, air mass transmission and region transmission, and control effects were analyzed based on environmental monitoring data and simulation. Mean PM2.5 concentrations during the heavy pollution episode in each city all exceeded 200 μg•m-3 and the peak value of hourly averaged concentration (834.5 μg•m-3) occurred in Handan. The meteorological conditions during the heavy pollution episode restricted the diffusion of pollutants, with low pressure and air mass transmission exacerbating the problem. The mean fraction of PM2.5 concentrations in local emissions was 47.1%, but this differed between cities due to variable meteorological conditions. The average reduction of PM2.5 concentrations was 27.6%, indicating that the implementation of a red alert measure was effective. If the emergency measures had been implemented a few days earlier, a greater reduction ratio would have been achieved; a 4.4% greater average reduction in PM2.5 concentrations would have occurred if the measures were implemented two days earlier, while taking action three or more days in advance would not have achieved significant improvement. © 2019, Science Press. All right reserved.

引用

页码：3397 / 3404

页数：7

共 24 条

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