Promulgation of State Implementation Plan Revisions; Infrastructure Requirements for the 2008 Lead, 2008 Ozone, 2010 NO2

The Environmental Protection Agency (EPA) is proposing to approve elements of State Implementation Plan (SIP) revisions from the State of Wyoming to demonstrate the State meets infrastructure requirements of the Clean Air Act (Act or CAA) for the National Ambient Air Quality Standards (NAAQS) promulgated for ozone on March 12, 2008, lead (Pb) on October 15, 2008, nitrogen dioxide (NO2) on January 22, 2010, sulfur dioxide (SO2) on June 2, 2010, and fine particulate matter (PM2.5) on December 14, 2012. The EPA is also proposing to approve SIP revisions the State submitted 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 the EPA.