1. School of Resources and Environment, Zunyi Normal College, Zunyi, People’s Republic of China
2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, People’s Republic of China
3. Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, People’s Republic of China
4. University of Chinese Academy of Sciences, Beijing, China
5. Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Canada