1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. College of Resources and Environment, Zunyi Normal University, Zunyi 563006, China
4. Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Ontario M3H 5T4, Canada