EPA is approving state implementation plan (SIP) revisions submitted by the State of California to meet the Clean Air Act (CAA) requirements applicable to the San Joaquin Valley, California extreme 1-hour ozone standard nonattainment area (SJV area). EPA is approving the SIP revisions for the SJV area as meeting applicable CAA and EPA regulatory requirements for the attainment and rate-of-progress demonstrations and their related contingency measures, reasonably available control measures, and other control requirements. In addition, EPA is approving the SJV Air Pollution Control District's Rule 9310, "School Bus Fleets."