Approval and Promulgation of State Implementation Plan Revisions; Infrastructure Monitoring Requirements for the 2008 Pb, 2010 SO2

The Environmental Protection Agency (EPA) is proposing to approve elements of State Implementation Plan (SIP) revisions from the State of Utah to demonstrate the State meets infrastructure monitoring requirements of the Clean Air Act (Act or CAA) for the National Ambient Air Quality Standards (NAAQS) promulgated for lead (Pb) on October 15, 2008, nitrogen dioxide (NO 2 ) on January 22, 2010, sulfur dioxide (SO 2 ) on June 2, 2010, and fine particulate matter (PM 2.5 ) on December 14, 2012. 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.