U.S. multi-pollutant emissions standards for model years 2027 and later light-duty and medium-duty vehicles

The U.S. multi-pollutant emissions standards for model years 2027 and later apply to light-duty vehicles (LDVs) and medium-duty vehicles (MDVs) and require tailpipe carbon dioxide (CO₂) emission reductions (in grams per mile, g/mi) that lower the industry-wide average for LDVs by 50% and for MDVs by 44%, both compared with the MY 2026 standards. Additionally, the rule establishes a new Tier 4 criteria pollutant emissions standard for non-methane organic gases (NMOG), nitrogen oxides (NO_x), particulate matter (PM), and other criteria pollutants and their precursors. The Environmental Protection Agency projects the standards will lead to up to $13 billion in annualized health benefits and $72 billion in annualized climate benefits by 2055.

Figure. Annualized costs, benefits, and fuel savings of the multi-pollutant rule, 2027 through 2055

The standards for LDVs and MDVs are performance-based. Vehicle manufacturers are free to select from an array of clean vehicle technologies, and compliance does not require selling any particular technology.

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