Section 52.2452 - Visibility protection(a) Reasonably Attributable Visibility Impairment. The requirements of section 169A of the Clean Air Act are not met because the plan does not include approvable measures for meeting the requirements of 40 CFR 51.305 for protection of visibility in mandatory Class I Federal areas.(g) EPA converts its limited approval/limited disapproval of Virginia's regional haze program to a full approval. This SIP revision changes Virginia's reliance from the Clean Air Interstate Rule to the Cross-State Air Pollution Rule to meet the regional haze SIP best available retrofit technology requirements for certain sources and to meet reasonable progress requirements.50 FR 28553, July 12, 1985, as amended at 52 FR 45137, Nov. 24, 1987; 77 FR 33659 , June 7, 2012; 77 FR 35291 , June 13, 2012; 82 FR 3129 , Jan. 10, 2017; 83 FR 42222 , Aug. 21, 2018