Tim Larson is a professor in the Department of Civil & Environmental Engineering and the Department of Environmental & Occupational Health Sciences, where he teaches courses on air pollution control and air quality modeling. He is also the co-director of the Master of Science in Civil Engineering: Energy Infrastructure. Larson has over 35 years of experience in air quality research, specifically in characterization of urban air pollution and its sources. His major focus in recent years has been on assessment of human exposure to outdoor air pollutants, and he has collaborated with other UW researchers on many projects related to the health consequences of exposure to air pollution. He holds a Ph.D. in civil engineering from the University of Washington.