Section 52.1531 - Visibility protection(a) The requirements of section 169A of the Clean Air Act are not met, because the plan does not include approvable procedures for protection of visibility in mandatory Class I Federal areas.(b) Regulation for visibility monitoring and new source review. The provisions of § 52.28 are hereby incorporated and made a part of the applicable plan for the State of New Hampshire.50 FR 28553, July 12, 1985, as amended at 52 FR 45137, Nov. 24, 1987; 82 FR 3129, Jan. 10, 2017