William C. Hinds, ScD, is an emeritus Professor in the Department of Environmental Health Science at the UCLA Fielding School of Public Health. His primary research is fundamental and applied research related to aerosols and industrial control of airborne contaminants. He is a diplomate of the American Board of Industrial Hygiene and a fellow of the American Industrial Hygiene Association, the American Association for Aerosol Research, and the International Aerosol Research Assembly.Yifang Zhu, PhD, is a Professor in the Department of Environmental Health Science at the UCLA Fielding School of Public Health. Her research is primarily in the field of air pollution, environmental exposure assessment, and aerosol science and technology. She was appointed to the California Air Resource Board (CARB)’s Research Screening Committee in January 2014. She has published more than 80 peer-reviewed journal articles on aerosols.