Promulgation of State Implementation Plan Revisions; Infrastructure Requirements for the 1997 and 2006 PM2.5, 2008 Lead, 2008 Ozone, and 2010 NO2 National Ambient Air Quality Standards; South Dakota

The Environmental Protection Agency (EPA) is approving elements of State Implementation Plan (SIP) revisions from the State of South Dakota to demonstrate the State meets infrastructure requirements of the Clean Air Act (CAA) for the National Ambient Air Quality Standards (NAAQS) promulgated for fine particulate matter (PM<INF>2.5</INF>) on July 18, 1997 and October 17, 2006; lead (Pb) on October 15, 2008; ozone on March 12, 2008; and nitrogen dioxide (NO<INF>2</INF>) on January 22, 2010. EPA is also approving SIP revisions the State submitted updating the Prevention of Significant Deterioration (PSD) program and provisions regarding state boards. Section 110(a) of the CAA requires that each state submit a SIP for the implementation, maintenance, and enforcement of each NAAQS promulgated by EPA.