title: Impact of emission control on PM2.5 and the chemical composition change in Beijing-Tianjin-Hebei during the APEC summit 2014.
abstract: The success of the emission reduction measures undertaken by authorities in the Asia-Pacific Economic Cooperation summit 2014 demonstrated that the Beijing-Tianjin-Hebei air quality can be improved by introducing integrated emission reduction measures. This paper combines observation data, emission reduction measures, and air quality simulations that were applied before, during, and after the emission control measure implement to analyze the chemical composition change and relationship between emissions and concentrations of pollutants in region. The 24-h PM2.5 samples were collected in the city Beijing, Shijiazhuang, and Tangshan during the period of 20 October to 25 November, 2014. The total PM2.5 mass was measured. PM2.5 samples were used for the analysis of inorganic elements, selected ions, and organic carbon (OC) and element carbon (EC). PM2.5 concentrations during the emission control period were decreased. Total PM2.5 concentrations were reduced by 54, 26, and 39 % when compared to non-emission control period in Beijing, Shijiazhuang, and Tangshan. The average element concentrations were reduced significantly by 75 % in Beijing, 37 % in Shijiazhuang, and 36 % in Tangshan. After the Asia-Pacific Economic Cooperation (APEC) conference, the average element concentration increased. At both cities, the concentration secondary water-soluble ions, primary carbon, and element carbon were reduced. However, the concentration of secondary carbon species increased in Beijing due to photochemical oxidants change. More stringent control of regional emissions will be needed for significant reductions of fine particulate pollution in the region to continue to improve air quality.
authors.affiliation: College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, People's Republic of China, 100124.|Environmental Meteorology Forecast Center of Beijing-Tianjin-Hebei, Chinese Meteorological Administration, Beijing, 100089, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wen
authors.affiliation: College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, People's Republic of China, 100124. chengsy@bjut.edu.cn.|Collaborative Innovation Center of Electric Vehicles, Beijing, 100081, China. chengsy@bjut.edu.cn.
authors.forename: Shuiyuan
authors.initials: S
authors.lastname: Cheng
authors.affiliation: Tangshan Environmental Monitoring Station, Tangshan, 063000, China.
authors.forename: Xufeng
authors.initials: X
authors.lastname: Chen
authors.affiliation: College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, People's Republic of China, 100124.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.affiliation: College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, People's Republic of China, 100124.
authors.forename: Song
authors.initials: S
authors.lastname: Li
authors.affiliation: College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, People's Republic of China, 100124.
authors.forename: Xiaoqi
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, People's Republic of China, 100124.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Liu
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control*; D001208:Asia; D000068476:Beijing; D002244:Carbon / Q000032:analysis; D002681:China; D002947:Cities; D004784:Environmental Monitoring; D052918:Environmental Restoration and Remediation; D052638:Particulate Matter / Q000032:analysis; D001335:Vehicle Emissions / Q000517:prevention & control*
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D001335:Vehicle Emissions; D002244:Carbon
keywords: AEPC summit; Chemical composition; Emission control assessment; PM2.5 emission control