State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry;
Institute of Atmospheric Physics;
Chinese Academy of Sciences;
Beijing 100029;
China;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
Atmosphere Sub-Center of Chinese Ecosystem Research Network;
Institute of Atmospheric Physics;
Chinese Academy of Sciences;
Beijing 100191;
China;
State Key Laboratory of Environmental Criteria and Risk Assessment;
Chinese Research Academy of Environmental Sciences;
Beijing 100012;
China;
Natural Resources and Environment Research Group;
Department of Chemical and Environmental Engineering;
University of Nottingham Ningbo China;
Ningbo 315100;
China;
State Key Laboratory of Water Environment Simulation;
School of Environment;
Beijing Normal University;
Beijing 100875;
China;
PM_(2.5); Fen-Wei plain; Chemical compositions; Secondary particulate; Source apportionment;