California State Motor Vehicle Pollution Control Standards; Greenhouse Gas Emissions From 2014 and Subsequent Model Year Medium- and Heavy-Duty Engines and Vehicles; Notice of Decision

The Environmental Protection Agency (EPA) is granting the California Air Resources Board's (``CARB's'') request for a waiver of Clean Air Act preemption for its greenhouse gas (``GHG'') emission regulation for the new 2014 and subsequent model year on-road medium- and heavy-duty engines and vehicles (``California Phase 1 GHG Regulation'') adopted in 2011. This regulation establishes requirements applicable to new motor vehicles with a gross vehicle weight rating exceeding 8,500 pounds and engines that power such motor vehicles, except for medium-duty passenger vehicles that are subject to California's Low Emission Vehicle Program. This regulation generally aligns California's GHG emission standards and test procedures with the federal GHG emission standards and test procedures that EPA adopted in 2011. A deemed-to-comply provision is included in CARB's regulation whereby manufacturers may demonstrate compliance with California's Phase 1 GHG Regulation by complying with EPA's Phase 1 regulation. This decision is issued under the authority of the Clean Air Act (``CAA'' or ``the Act'').