91 STAT. 742 Ante, p. 731.
Ante, pp. 691-696. Study, report to Congress. 42 USC 7470 note.
PUBLIC LAW 95-95—AUG. 7, 1977 States in carrying out their functions under part C of title I of the Clean Air Act (relating to prevention of significant deterioration of air quality) with respect to pollutants, other than sulfur oxides and particulates, for which national ambient air quality standards are promulgated. Such guidance document shall include recommended strategies for controlling photochemical oxidants on a regional or multistate basis for the purpose of implementing part C and section 110 of such Act. (d) Not later than two years after the date of enactment of this Act, the Administrator shall complete a study and report to the Congress on the progress made in carrying out part C of title I of the Clean Air Act (relating to significant deterioration of air quality) and the problems associated with carrying out such section, including recommendations for legislative changes necessary to implement strategies for controlling photochemical oxidants on a regional or multistate basis. VISIBILITY PROTECTION
SEC. 128. (a) Part C of title I of the Clean Air Act, is amended by adding the following new section after section 168: "SUBPART 2 u VI S I B I L I T Y PROTECTION FOR FEDERAL CLASS I AREAS
42 USC 7491.
Review, consultation. Revision. List.
Study, report to Congress. Recommendations,
V,
Regulations, notice and hearing.
"SEC. 169A. (a)(1) Congress hereby declares as a national ^oal the prevention of any future, and the remedying of any existing, impairment of visibility in mandatory class I Federal areas which impairment results from manmade air pollution. "(2) Not later than six months after the date of the enactment of this section, the Secretary of the Interior in consultation with other Federal land managers shall review all mandatory class I Federal areas and identify those where visibility is an important value of the area. From time to time the Secretary of the Interior may revise such identifications. Not later than one year after such date of enactment, the Administrator shall, after consultation with the Secretary of the Interior, promulgate a list of mandatory class I Federal areas in which he determines visibility is an important value. "(3) Not later than eighteen months after the date of enactment of this section, the Administrator shall complete a study and report to Congress on available methods for implementing the national goal set forth in paragraph (1). Such report shall include recommendations for— "(A) methods for identifying, characterizing, determining, quantifying, and measuring visibility impairment in Federal areas referred to in paragraph (1), and "(B) modeling techniques (or other methods) for determining the extent to which manmade air pollution may reasonably be anticipated to cause or contribute to such impairment, and "(C) methods for preventing and remedying such manmade air pollution and resulting visibility impairment. Such report shall also identify the classes or categories of sources and the types of air pollutants which, alone or in conjunction with other sources or pollutants, may reasonably be anticipated to cause or contribute significantly to impairment of visibility. " (4) Not later than twenty-four months after the date of enactment of this section, and after notice and public hearing, the Administrator shall promulgate regulations to assure (A) reasonable progress toward
�
