1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
2. State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China
3. Microsoft Research Asia, Beijing 100080, China
4. Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States
5. School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China
6. School of Electronics Engineering and Computer Science, Peking University, Beijing 100084, China
7. College of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, China