1 Jonathan J. Buonocore, Patrick L. Kinney, Brian J. Sousa, and Jonathan I. Levy are with the Department of Environmental Health, Boston University School of Public Health, Boston, MA. Jeremy Fisher and Daniel Prull are with the Sierra Club, Oakland, CA. Mary D. Willis is with the Department of Epidemiology, Boston University School of Public Health. Saravanan Arunachalam is with the Institute for the Environment, University of North Carolina, Chapel Hill. Frederica Perera is with the Department of Environmental Health, Columbia Mailman School of Public Health, New York, NY.