The proceedings of a conference on international environmental monitoring is presented, along with a commentary, reports from activity groups, and appended tabular information. Major objectives of the 25 participants from international organizations, national governments, and research institutions were to review accomplishments in global and regional monitoring since 1972, reevaluate international monitoring needs, and provide guidance to the Rockefeller Foundation in supporting international environmental monitoring efforts. An overview of systems which monitor environmental quality is provided by Ralph W. Richardson, Jr., of the Rockefeller Foundation. A report by Martin Holgate (Department of the Environment, England) identifies major topics of concern related to environmental assessment, including environmental policy, costs of environmental monitoring, deciding what to monitor, and uses of monitoring data. Two papers by Brian Martin and Frances Sella (Global Monitoring System, Nairobi, Kenya) discuss global monitoring activities. The remaining papers are concerned with lead monitoring in Finland (Sven Hernberg, Institute of Occupational Health, Helsinki), rangeland resources in Kenya (David Western, University of Nairobi), monitoring organisms in coastal waters (Edward Goldberg, Scripps Institution of Oceanography, La Jolla, California), ozone networks (R.E. Munn, Interenvironmental Research Branch, Canada), and mercury monitoring in Sweden (T. Westermark, Royal Institute of Technology, Stockholm, Sweden). A directory of conference participants is included. (DB)