1. a Department of Mechanical Engineering , University of California , Riverside , CA , USA
2. b Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT) , University of California , Riverside , CA , USA
3. c Spokane Research Laboratory , National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention , Spokane , WA , USA
4. d Department of Environmental Science and Engineering , Gwangju Institute of Science and Technology , Gwangju , Korea
5. e Department of Mechanical Engineering , University of Minnesota , Minneapolis , MN , USA