Cover Page MENU Table of Contents Introduction The Early Years, 1864-1918 Defining The System, 1919-1932 The New Deal Years, 1933-1941 The Poverty Years, 1942-1956 Questions of Resource Management, 1957-1963 The Ecological Revolution, 1964-1969 Transformation and Expansion, 1970-1980 A System Threatened, 1981-1992 Appendix: Summaries of Lengthy Documents About the Editor		The Critical Documents Appendix: Summaries of Lengthy Documents COASTAL ZONE MANAGEMENT ACT, 1972 CLEAN AIR ACT OF 1967 (PL Chapter 360, 69 Stat. 322) The main purpose of this act is to protect and enhance the nation's air quality to promote the public health and welfare. The act establishes specific programs that provide special protection for air resources and air quality-related values (AQRVs) associated with NPS units. For example, sections 160-169 of the act establish a program to prevent significant deterioration (PSD) of air quality in clean air regions of the country. The purposes of the PSD program include: to protect resources that might be sensitive to pollutant concentrations lower than the established national standards and "to preserve, protect and enhance the air quality in national parks, national monuments, national seashores, and national or regional natural, recreational, scenic or historic value." In section 169A of the act. Congress also established a national goal of remedying any existing and preventing any future man-made visibility impairment in mandatory class I areas. Summary taken from NPS-77 Guideline (1993) provided by the Division of Natural Resoures, National Park Service, Washington, D.C. NEXT>Endangered Species Act, 1973
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