Source Contributions of Urban PM2.5 in the Beijing–Tianjin–Hebei Region: Changes between 2006 and 2013 and Relative Impacts of Emissions and Meteorology

Xin Li1,2, Qiang Zhang1, Yang Zhang2,3, Bo Zheng4, Mingwei Li5, Kai Wang2, Ying Chen6, Timothy John Wallington7, Weijian Han7, Wei Shen8, Xiaoye Zhang9 and Kebin He3,10, (1)Department of Earth System Science, Tsinghua University, Beijing, China, (2)North Carolina State University, Department of Marine, Earth, and Atmospheric Sciences, Raleigh, NC, United States, (3)Collaborative Innovation Center for Regional Environmental Quality, Beijing, China, (4)State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China, (5)Center for Earth System Science, Tsinghua University, Beijing, China, (6)Lancaster University, Lancaster, United Kingdom, (7)Research and Advanced Engineering, Ford Motor Company, Dearborn, MI, United States, (8)Asia Pacific Research, Ford Motor Company, Beijing, China, (9)Chinese Academy of Meteorological Sciences, Beijing, China, (10)School of Environment, Tsinghua University, Beijing, China