Proposed Rule To Target Vehicle Greenhouse Gas Emissions and Mileage

September 14, 2011

By Sept. 28, 2011, EPA and the US Dept. of Transportation's National Highway Traffic Safety Administration (NHTSA) say they will jointly release proposed standards designed to significantly increase fuel mileage and reduce greenhouse gas emissions from passenger cars, light trucks, and medium-duty passenger vehicles in model years 2017-2025. The standards are being coordinated with the state of California. A final rule is scheduled to be issued by July 31, 2012.

The new standards are expected to build on efforts made to develop similar standards for model years 2012-2016, finalized May 7, 2010.

In light of President Obama's recent decision to stop development of another major EPA regulation — setting a more stringent standard for ground-level ozone — it remains uncertain whether the vehicle regulations will proceed on schedule. However, some observers say this regulation might advance because the vehicle industry generally supports it. Among those who are currently saying they will be cooperative are BMW, Chrysler, Ford, GM, Honda, Hyundai, Nissan, and Toyota. For their letters of qualified support, and those of others, including the California Air Resources Board, see:

Among other sources for possible comment are: