Shaanxi Normal University - National Demonstration Center for Experimental Geography Education, Shaanxi Normal University, Shaanxi Normal University - National Demonstration Center for Experimental Geography Education, Shaanxi Normal University - National Demonstration Center for Experimental Geography Education, Carnegie Mellon University - The Center for Atmospheric Particle Studies, Shaanxi Normal University - National Demonstration Center for Experimental Geography Education, Shaanxi Normal University - National Demonstration Center for Experimental Geography Education, Shaanxi Normal University - National Demonstration Center for Experimental Geography Education, Shaanxi Normal University - National Demonstration Center for Experimental Geography Education, Chinese Academy of Sciences (CAS) - Key Lab of Aerosol Chemistry & Physics, Guangdong University of Technology - Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangdong University of Technology - Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health and Chinese Academy of Sciences (CAS) - The Institute of Atmospheric Physics