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Subpart D—Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value

Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value

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  3. Title 40
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  5. Chapter I
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  7. Part 81
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  9. Subpart D
ContainsSections 81.400–81.437
CorpusDaily eCFR
Displayed edition2026-05-07
Last updated2026-05-07

Subpart D—Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value

Sections

AuthoritySecs. 101(b)(1), 110, 169A(a)(2), and 301(a), Clean Air Act as amended (42 U.S.C. 7401(b), 7410, 7491(a)(2), 7601(a)).
Source44 FR 69124, Nov. 30, 1979, unless otherwise noted.