Control of Air Pollution From New Motor Vehicles: Amendments to the Tier 2 Motor Vehicle Emission Regulations

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EPA is taking direct final action to clarify and revise certain provisions of the Tier 2/Gasoline Sulfur regulations (hereinafter referred to as the Tier 2 rule). Today's action makes minor revisions to clarify the regulations governing compliance with the Tier 2 rule, and it modifies the Tier 2 program to provide for the certification of cleaner diesel engines than were anticipated during the interim Tier 2 program (through the 2006 model year).