2004 Ventura County 1-Hour Ozone Plan Categories Topics Air Quality Plans Programs California State Implementation Plans Type Information In April 2004, CARB submitted the 1-hour Ozone plan to United States Environmental Protection Agency (U.S. EPA) for approval. CARB DocumentsPlan Submittal Letter to U.S. EPA (April 21, 2004)Executive Order G-125-321 (April 21, 2004)Letter Parallel Processing to U.S. EPA (April 13. 2004)Motor Vehicle Emissions Budgets and Documentation Budget Derivation SummarySummary of Methods Used to Develop Baseline Planning InventoriesInventory Summary and Budget Derivation SpreadsheetDistrict DocumentVentura County 2004 Air Quality Management PlanU.S. EPA DocumentsApproval of 1-Hour Ozone Plan (January 8, 1997)Final Approval of Attainment (May 27, 2009) Related Resources Western Mojave Desert 70 ppb Ozone Attainment Plan 2023 Yuba City-Marysville Planning Area PM2.5 2nd Maintenance Plan South Coast 2022 Air Quality Management Plan