This document is a reference directory that describes 33 interagency committees and their subcommittees or components that deal with environmental health. The directory was developed and compiled by the interagency Task force on Environmental Cancer and Heart and Lung Disease. The directory is intended to promote coordination and information exchange among the listed groups and the Agencies and institutions involved in identifying problems and initiating research in environmentally related cancer and heart and lung diseases. Information reported for each committee includes membership listings and Agency affiliations, charter, statement of activities and accomplishments, listing of publications, products, meeting schedule, committee duration, and work groups. This is the second edition of the directory. The member Agencies of this Task Force include: Environmental Protection Agency; National Cancer Institute; National Heart, Lung and Blood Institute; National Institute for Occupational Safety and Health; National Institute of Environmental Health Sciences; National Center for Health Statistics; Center for Disease Control; and Food and Drug Administration.