1. Department of Chemistry, The Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong, China
2. Division of Environment & Sustainability, The Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong, China
3. State Environmental Protection Key Laboratory of the Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China
4. Institute of Environmental Pollution and Health, Shanghai University, Shanghai 200072, China
5. Aerodyne Research Inc., Billerica, Massachusetts 01821, United States
6. Department of Environmental Science, Policy, and Management, University of California, Berkeley, California 94720, United States
7. Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, United States
8. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China