1. State Environmental Protection Key Laboratory of Urban
Ambient Air Particulate Matter Pollution Prevention and Control, College
of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
2. School of Civil and
Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0512, United States
3. Environmental Monitoring
Center of Tianjin, Tianjin 300191, China
4. Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States