1. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
2. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
3. College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
5. Aerodyne Research Inc., Billerica, Massachusetts 01821, United States
6. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States