My research is focused on improving our understanding of urban air quality. I am motivated by the fact that air pollution causes adverse health effects, including illness and death and by reducing air pollutant exposure, health and well-being can be improved. A novel component of my work is a focus on the indoor environment, where people spend the majority of their time. I am one of the leading researchers on the use of control technologies, and specifically for reducing infectious disease transmission, using ultraviolet germicidal irradiation. I have also been a leader in investigating the influence that building characteristics have on indoor air quality including understanding housing conditions in lower socioeconomic neighborhoods and studying the microbiology in homes.

To date my research program has been supported by the U.S. EPA and EPA Region 8,  Colorado Department of Public Health and Environment, Centers for Disease Control and Prevention, the National Institutes of Health, the National Science Foundation, U.S. Department of Housing and Urban Development, American society of Heating, Refrigerating and Air-Conditioning Engineers, the Alfred P. Sloan Foundation, other non-profit organizations and industry.

Research Group

Current Research Projects

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