1. Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2. The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin 999077, Hong Kong, China
3. Key Lab of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710049, China
4. Divison of Atmospheric Sciences, Desert Research Institute, Reno, Nevada 89512, United States
5. School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China