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The Pollutant Sources, Dynamics and Chemistry Group conducts research to characterize and better understand the sources of airborne volatile, semi-volatile and particulate organic pollutants in the indoor environment. This research includes studies of the physical and chemical processes that govern indoor air pollutant concentrations and exposures. The motivation is to contribute to the reduction of potential human health effects. A central goal in studies sponsored by the U.S. Department of Energy is to improve the quality of indoor environments by reducing occupant exposures to pollutants in concert with achieving energy efficiency goals in the buildings sector. New, innovative measurement methods are designed and tested; physically-based pollutant source models are developed; laboratory studies are conducted in chambers that simulate indoor environments; and detailed field investigations are performed. Additionally, the PSD&C group participates in several multidisciplinary research projects conducted by other groups in the Indoor Environment Program and the Environmental Energy Technologies Division.