1 Erika S. Svendsen, Gillian Baine and Lindsay K. Campbell are with the USDA Forest Service, Northern Research Station, New York City Urban Field Station, New York, NY. Mary E. Northridge is with the Department of Epidemiology and Health Promotion, New York University College of Dentistry, New York, NY. Sara S. Metcalf is with the Department of Geography, University at Buffalo, The State University of New York, Buffalo.