The Collaborative on Health and the Environment, is an active network of organizations and individuals sharing the basic goal of improving human health by reducing exposure to toxicants in our bodies and the environment. Our goal is the formation of an alliance of individuals and organizations that can make a positive impact on local and national public policy regarding environmental health.

CHE-Penn is a regional affiliate of the Collaborative on Health and the Environment (CHE, pronounced "chay") a nonpartisan partnership organization based in Bolinas, California, working to further knowledge, action and cooperation regarding environmental contributors to disease and other health problems. Participation is open to health professionals, researchers, advocacy organizations, health-affected and patient groups, and everyone interested in the effects of environmental toxics on human health.