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42 U.S. Code § 7492. Visibility
(a) Studies
(1) The Administrator, in conjunction with the National Park Service and other appropriate Federal agencies, shall conduct research to identify and evaluate sources and source regions of both visibility impairment and regions that provide predominantly clean air in class I areas. A total of $8,000,000 per year for 5 years is authorized to be appropriated for the Environmental Protection Agency and the other Federal agencies to conduct this research. The research shall include—
(A)
expansion of current visibility related monitoring in class I areas;
(B)
assessment of current sources of visibility impairing pollution and clean air corridors;
(C)
adaptation of regional air quality models for the assessment of visibility;
(D)
studies of atmospheric chemistry and physics of visibility.
(2)
Based on the findings available from the research required in subsection (a)(1) as well as other available scientific and technical data, studies, and other available information pertaining to visibility source-receptor relationships, the Administrator shall conduct an assessment and evaluation that identifies, to the extent possible, sources and source regions of visibility impairment including natural sources as well as source regions of clear air for class I areas. The Administrator shall produce interim findings from this study within 3 years after November 15, 1990.