Motor Vehicle Emissions Budgets in Progress, Attainment, and Maintenance State Implementation Plans for Ozone, Carbon Monoxide, and Nitrogen Dioxide; California

EPA is taking final action to limit the duration of our approvals of motor vehicle emissions budgets ("budgets") in certain existing California state implementation plans (SIPs) that provide for progress, attainment, and maintenance of the 1-hour ozone, 8-hour carbon monoxide (CO), and annual nitrogen dioxide (NO2) national ambient air quality standards (NAAQS). Specifically, we are limiting our approvals of the existing budgets to last only until the effective date of our adequacy finding for new budgets that replace the existing approved budgets for the same pollutant, Clean Air Act (CAA) requirement, and year. The State of California will submit new budgets as part of comprehensive revisions to certain approved progress, attainment, and maintenance plans that reflect updated information and a new version of California's motor vehicle emission factor model. On the effective date of EPA's adequacy finding for a new budget, our approval of the existing budget would terminate and thus the new adequate budget would apply instead of the existing budget for transportation conformity purposes.