1. Department of Mechanical Engineering, University of California Riverside, Riverside, California, USA;
2. College of Engineering-Center for Environmental Research and Technology (CE-CERT), University of California Riverside, Riverside, California, USA;
3. Department of Environmental Sciences, University of California Riverside, Riverside, California, USA;
4. Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology, Seoul, Korea;
5. Center for Particulate Air Pollution and Health, Korea Institute of Science and Technology, Seoul, Korea