2023-07974: Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles

Summary

Under its Clean Air Act authority, the Environmental Protection Agency (EPA) is proposing new, more stringent emissions standards for criteria pollutants and greenhouse gases (GHG) for light- duty vehicles and Class 2b and 3 ("medium-duty") vehicles that would phase-in over model years 2027 through 2032. In addition, EPA is proposing GHG program revisions in several areas, including off-cycle and air conditioning credits, the treatment of upstream emissions associated with zero-emission vehicles and plug-in hybrid electric vehicles in compliance calculations, medium-duty vehicle incentive multipliers, and vehicle certification and compliance. EPA is also proposing new standards to control refueling emissions from incomplete medium-duty vehicles, and battery durability and warranty requirements for light-duty and medium-duty plug-in vehicles. EPA is also proposing minor amendments to update program requirements related to aftermarket fuel conversions, importing vehicles and engines, evaporative emission test procedures, and test fuel specifications for measuring fuel economy.

The agency’s own summary, as published.

What this changes

Amends 6 parts of the Code of Federal Regulations — the standing rules this notice rewrites.

• 40 CFR 85 Control of Air Pollution from Mobile Sources
• 40 CFR 86 Control of Emissions from New and In-Use Highway Vehicles and Engines
• 40 CFR 600 Fuel Economy and Greenhouse Gas Exhaust Emissions of Motor Vehicles
• 40 CFR 1036 Control of Emissions from New and In-Use Heavy-Duty Highway Engines
• 40 CFR 1037 Control of Emissions from New Heavy-Duty Motor Vehicles
• 40 CFR 1066 Vehicle-Testing Procedures