Dr. Levy's research centers on air pollution exposure assessment and health risk assessment, with a focus on urban environments and issues of heterogeneity and equity. Major research topics include evaluating spatial patterns of air pollution in complex urban terrain, developing methods to quantify the magnitude and distribution of health benefits associated with emissions controls for motor vehicles and power plants, using systems science approaches to evaluate the influence of indoor environmental exposures on pediatric asthma in low-income housing, and developing methods for community-based cumulative risk assessment that includes chemical and non-chemical stressors. He has been a member of several National Research Council committees, including the Committee on Science for EPA's Future, the Committee on Health Impact Assessment, and the Committee on Improving Risk Analysis Approaches Used by the US Environmental Protection Agency. He also served on the Advisory Council on Clean Air Compliance Analysis, which provided guidance to EPA on the impact of the Clean Air Act on health, the economy, and the environment.