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Since the early 1980s, the core mission of HEI is to study the health effects of air pollution with a focus on vehicular emissions. More recently, the scope has broadened to air pollution in general, because ultimately people are exposed to a mixture of pollutants from different sources. This page provides a gateway to HEI's research on diesel exhaust, mixtures, ozone, statistical methods, and other important topics. The program covers a wide area of research approaches, including epidemiology, toxicology, exposure science, and statistics.