Air Plan Approval; SC; Regional Haze Plan and Prong 4 (Visibility) for the 2012 PM2.5

The Environmental Protection Agency (EPA) is proposing to take the following four actions regarding the South Carolina State Implementation Plan (SIP): Approve the portion of South Carolina's September 5, 2017, SIP submittal seeking to change reliance from the Clean Air Interstate Rule (CAIR) to the Cross-State Air Pollution Rule (CSAPR) for certain regional haze requirements; convert EPA's limited approval/limited disapproval of South Carolina's regional haze plan to a full approval; remove EPA's Federal Implementation Plan (FIP) for South Carolina, which replaced reliance on CAIR with reliance on CSAPR to address the deficiencies identified in the limited disapproval of South Carolina's regional haze plan; and convert the conditional approvals of the visibility prong of South Carolina's infrastructure SIP submittals for the 2012 Fine Particulate Matter (PM2.5), 2010 Nitrogen Dioxide (NO2), 2010 Sulfur Dioxide (SO2), and 2008 8-hour Ozone National Ambient Air Quality Standards (NAAQS) to full approvals.