This is the second EPA report to Congress on federal research required biennially under Section 153(g) of the Clean Air Act Amendments of 1977 (Public Law 95-95). It emphasizes the findings of EPA-supported research and related studies and presents the latest assessment and understanding of stratospheric ozone depletion by chlorofluorocarbons as reported by the National Academy of Science in 1979. This EPA report does not describe all the relevant research results obtained by other federal agencies since Section 154 of the Clean Air Act requires them to submit separate reports, but their results are incorporated to the extent possible. Research supported by EPA has focused on analyzing the effects of increased UV-B exposures on humans and nonhuman biological systems. The potential for significant adverse environmental effects has been suggested by research accomplished to date. It has been established that additional research, both short- and long-term, is needed to identify and quantify the direct and indirect effects of ozone depletion in all areas--human health, other biological/ecological systems, climate monitoring, economics, and social issues.

Cover title: Research and development, results of research related to stratospheric ozone protection. "October 1980." Includes bibliographical references (pages 47-49). "EPA-600/9-80-043."