1. Department of Environmental Engineering Sciences, Engineering School of Sustainable Infrastructure and Environment, University of Florida, Gainesville, Florida, USA;
2. Molecular Mechanisms Branch, Bioeffects Division, Airman Systems Directorate, 711th Human Performance Wing/RHDJ, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio, USA;
3. Department of Environmental & Global Health, University of Florida, Gainesville, Florida, USA;
4. Aerosol Dynamics Inc., Berkley, California, USA