Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is approving portions of the State Implementation Plan (SIP) revisions submitted to the EPA by the State of Texas (the State) for the 2008 8-hour ozone National Ambient Air Quality Standard (NAAQS). The SIP revisions being approved describe how CAA requirements for vehicle Inspection and Maintenance (I/M) are met in the Dallas-Fort Worth (DFW) and Houston-Galveston-Brazoria (HGB) Serious ozone nonattainment areas.