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Environmental research in the Department of Mechanical Engineering focuses on the formation of particulates in industrial and natural processes. The Particle Technology Lab in the Department has an almost 50-year history of developing instrumentation for the study of particulate generation in the gas phase. Developments in this area have spawned several companies that successfully develop and market instrumentation to study particulate formation in the gas phase. Current research in the environmental area focuses on particulate formation in the atmosphere leading to smog, particulate emissions from combustion engines, particle emissions from commercial kitchens, and the health impact of air-borne nanoparticulates in work environments. Additonal efforts are focused on developing new filtration tools to remedy particulate emissions in a wide range of environments.