Approval and Promulgation of Air Quality Implementation Plans; Texas; Infrastructure or Requirements for the 2008 Ozone and 2010 Nitrogen Dioxide National Ambient Air Quality Standards
The Environmental Protection Agency (EPA) is approving elements of State Implementation Plan (SIP) submissions from the State of Texas for Ozone (O<INF>3</INF>) and Nitrogen Dioxide (NO<INF>2</INF>) National Ambient Air Quality Standards (NAAQS). These submittals address how the existing SIP provides for implementation, maintenance, and enforcement of the 2008 O<INF>3</INF> and 2010 NO<INF>2</INF> NAAQS (infrastructure SIPs or i-SIPs). These i-SIPs ensure that the State's SIP is adequate to meet the State's responsibilities under the Federal Clean Air Act (CAA).