On September 22, 2022, CARB adopted the 2022 State Strategy for the State Implementation Plan (2022 State SIP Strategy). The 2022 State SIP Strategy describes CARB’s roadmap for reducing emissions from State sources to support attainment across the state of the health-based 70 parts per billion (ppb) 8-hour ozone national ambient air quality standard (standard). The 2022 State SIP Strategy measure commitments and associated emissions reductions were incorporated into attainment plans for the 70 ppb 8-hour ozone standard and 12 μg/m3 PM2.5 standard submitted to U.S. Environmental Protection Agency in 2023 and 2024.
Over the last year, California’s clean air progress has been undermined by unprecedented federal interference, including the illegal disapproval of three previous federal actions waiving preemption for some of the State’s major vehicle and engines emissions control programs. The 2022 State SIP Strategy commitments and baseline emissions inventories within each regional attainment plan did not account for this federal interference. Since U.S. EPA has not yet acted on the attainment plans for the 70 ppb 8-hour ozone standard or the 2022 State SIP Strategy, CARB is revising these plans to reflect these federal actions. The 2026 State Implementation Plan Revisions for the California Extreme Ozone Nonattainment Areas (2026 Extreme Ozone SIP Revision) revises the 2022 State SIP Strategy measure commitments, aggregate emissions reduction commitments, and other elements as needed for the South Coast Air Basin, Coachella Valley, and San Joaquin Valley nonattainment areas. The 2026 Extreme Ozone SIP Revision supports the approval of the attainment plans currently awaiting U.S. EPA action.
