1. Xi’an Key Laboratory of Solid Waste Recycling and Resource Recovery, Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2. Shaanxi Key Laboratory of Environmental Monitoring and Forewarning of Trace Pollutions, Shaanxi Environmental Monitoring Center Station, Xi’an 710054, China
3. Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto M3H5T4, Canada
4. School of Chemistry, Xi’an Jiaotong University, Xi’an 710049, China
5. Division of Atmospheric Sciences, Desert Research Institute, Reno, Nevada 89512, United States
6. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China