Impact of the coal-to-electricity policy on PM2.5 concentration in Beijing-Tianjin-Hebei region
ZHANG Ru-ting1, CHEN Chuan-min1, WU Hua-cheng2, ZHOU Wei-qing2, LI Peng2
1. College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; 2. Jibei Electric Power Research Institute, State Grid Jibei Electric Power Co., Ltd., North China Electric Power Research Institute Company Limited, Beijing 100045, China
Abstract：Based on the Weather Research and Forecasting Model with Chemistry(WRF-Chem) model and combined with the meteorological parameters, the variation of PM2.5 emission before and after the implementation of the coal-to-electricity policy during the heating period(November 2018 to March 2019) over the BTH region was simulated and analyzed from the aspects of the PM2.5 concentration reduction and its spatial-temporal variation characteristic. The WRF-Chem model well stimulated the variation of PM2.5 concentration over the BTH region, and the correlation coefficient between simulated values and observed values in Beijing,Tianjin and Shijiazhuang were 0.66, 0.66 and 0.52, respectively, showing a good correlation. The implementation of the coal-to-electricity policy had an obvious effect on the reduction of PM2.5 concentration in key areas over the BTH region. The average daily mean reduction of PM2.5 was 0.2~6.1μg/m3, and the average reduction ratio was 1.2%~7.8%. The variation of the PM2.5 hourly mean concentration showed that the average reduction of PM2.5 in December 2018 was 0.4~8.3μg/m3, and the average reduction ratio was 2.3%~7.7%. Particularly, the emission reduction in Daxing District of Beijing reached 8.3μg/m3, while the reduction ratio in Tianjin area reached 7.7%. Under special meteorological conditions, the scope of the coal-to-electricity policy over the BTH region could spread to Shandong, Jiangsu, Henan and the western of Shanxi, and the maximum hourly mean reduction of PM2.5 was more than 50μg/m3.
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