Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is approving a revision to the Texas State Implementation Plan (SIP) to meet the Reasonable Further Progress (RFP) requirements for the Houston-Galveston-Brazoria (HGB) moderate 2008 8-hour ozone nonattainment area (HGB area). EPA is approving the RFP demonstration, contingency measures, motor vehicle emissions budgets (MVEBs) and an updated 2011 base year emissions inventory.