1. State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
2. School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K.
3. Beijing Huanaco Innovation Co., Ltd., Beijing 102400, China
4. Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China
5. Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado 80305, United States
6. School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, U.K.
7. Department of Atmospheric and Oceanic Sciences & Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China
8. Meteorological Observation Centre of China Meteorological Administration (MOC/CMA), Beijing 100081, China