California State Motor Vehicle Pollution Control Standards; Notice of Waiver of Clean Air Act Preemption; California's 2010 Model Year Heavy-Duty Vehicle and Engine On-Board Diagnostic Standards

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EPA has granted the California Air Resources Board (CARB) its request to confirm that its amendments to California's heavy-duty vehicle and engine on-board diagnostic (HD OBD) requirements that relax the standards for 2010-2012 model years (MYs) are within the scope of a previous waiver of preemption of the Clean Air Act (Act). The amendments to the HD OBD requirements for MY 2013 and later are granted a new waiver of preemption.