1. Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan;
2. Department of Biology, University of New Mexico, Albuquerque, New Mexico, USA;
3. Nicholas School of the Environment, Duke University, Durham, North Carolina, USA;
4. Department of Civil and Environmental Engineering, Duke University, Durham, North Carolina, USA;
5. Department of Civil Engineering College of Engineering, National Central University, Taoyuan, Taiwan;
6. Division of Atmospheric Sciences, Desert Research Institute, Reno, Nevada, USA