1. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
2. College of Environmental Science and Engineering, Hunan University, Hunan, China
3. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
4. Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc, Boston, Massachusetts, USA
5. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA