1. School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China
2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China
3. Department of Earth System Science, Tsinghua University, Beijing 100084, China
4. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
5. Department of Earth System Science, University of California, Irvine, CA 92697, USA
6. Jiangsu Environmental Monitoring Center, Nanjing 210036, China
7. Jiangsu Provincial Academy of Environment Science, Nanjing 210036, China
8. Shanghai Environmental Monitoring Center, Shanghai 200030, China
9. Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Environmental Monitoring Center, Beijing 100048, China