1. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China
2. Department of Atmospheric Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
3. Center for Energy and Environmental Resources, University of Texas at Austin, Austin, Texas 78712, United States