This document provides a preliminary set of environmental indicators by which to measure environmental performance. The indicators are patterned on the outline of the Organisation for Economic Cooperation and Development (OECD) "Report on the State of the Environment," a companion volume published in the same year. This volume is comprised of 18 environmental indicators, followed by 7 key indicators reflecting economic and population changes of environmental significance. It includes indicators of environmental performance, some relating to environmental quality itself (e.g., river quality, nature protection), some to national environmental goals (e.g., sustainable use of water resources, controlling waste generation), and some to international environmental agreements and issues (e.g., sulphur oxide emissions, trade in forest products). For each indicator, an introductory statement is given, accompanied by the basic data and a graphic illustration providing information on trends since 1970, where possible, as well as information on the present state. The document is printed in both English and French versions in parallel columns. (KR)