title: "APEC blue"--The effects and implications of joint pollution prevention and control program.
abstract: To ensure good air quality in Beijing during Asia-Pacific Economic Cooperation (APEC) China 2014, Beijing and its neighboring five provinces and the associated cities were combined under the Joint Prevention and Control of Atmospheric Pollution (JPCAP) program, which implemented rigorous cooperative emission reduction measures. The program was a unique and large-scale artificial experiment that showed that such measures can achieve excellent results, and it led to the popular "APEC blue" catchphrase (i.e., Beijing's skies became blue as pollution levels decreased). This artificial experiment provided the means to effectively conduct JPCAP strategies in the future. Accordingly, our research focused on the characteristics of the six primary pollutants in Beijing. We found that the JPCAP measures directly reduced concentrations of all pollutants except O3. Through correlation analysis, we found that the band distribution of the cities with strong correlations in PM2.5 and PM10 concentrations was affected by wind conditions. Therefore, JPCAP measures should account for specific seasonal and climatic conditions. Based on cluster analysis using the results from the correlation analysis, we divided 13 cities within a 300-km radius of Beijing into different groups according to the similarity of their PM2.5 and PM10 correlation coefficients. For JPCAP measures relevant to PM2.5 and PM10, we found differences in the degrees of collaboration among cities. Therefore, depending upon the pollutant type, the JPCAP strategy should account for the cities involved, the scope of the core area, and the optimal cities to involve in the collaborative efforts based on cost-effectiveness and collaborative difficulty among the involved cities.
authors.affiliation: Sino-US Global Logistics Institute, Shanghai Jiao Tong University, Shanghai 200030, China; Antai College of Economics and Management, Shanghai Jiao Tong University, Shanghai 200030, China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Wang
authors.affiliation: Sino-US Global Logistics Institute, Shanghai Jiao Tong University, Shanghai 200030, China; Antai College of Economics and Management, Shanghai Jiao Tong University, Shanghai 200030, China. Electronic address: ljzhao70@sjtu.edu.cn.
authors.forename: Laijun
authors.initials: L
authors.lastname: Zhao
authors.affiliation: School of Management, Shanghai University, Shanghai 200444, China.
authors.forename: Yujing
authors.initials: Y
authors.lastname: Xie
authors.affiliation: Antai College of Economics and Management, Shanghai Jiao Tong University, Shanghai 200030, China.
authors.forename: Qingmi
authors.initials: Q
authors.lastname: Hu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000517:prevention & control* / Q000706:statistics & numerical data; D002681:China; D004784:Environmental Monitoring; D058735:Environmental Policy; D010126:Ozone / Q000032:analysis; D052638:Particulate Matter / Q000032:analysis; D012621:Seasons
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D010126:Ozone
keywords: APEC blue; Cluster analysis; Collaborative pollution reduction; Correlation analysis; Joint prevention and control