1. Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi’an University of Architecture and Technology, Xi’an 710055, China
2. Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
3. Key Lab of Aerosol Chemistry & Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China
4. Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Canada
5. Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Hong Kong, China