Regulatory Announcement

EPA and NHTSA Issue a Supplemental 

Notice in the Process for Setting 

Future Greenhouse Gas and Fuel 

Economy Standards for Passenger 

Cars and LightTrucks 

The U.S. Environmental Protection Agency (EPA) and the 

National Highway Traffic Safety Administration (NHTSA), 

on behalf of the U.S. Department of Transportation, are releasing a 

joint Supplemental Notice of Intent (NOI) to begin developing new 

standards for greenhouse gas (GHG) and fuel economy for lightduty vehicles in model years (MY) 2017-2025. This Supplemental 

Notice follows the joint NOI released on September 30, 2010,1

 and 

is meant to aid the public’s understanding of many key issues facing 

the agencies as we continue the process of developing the upcoming 

rulemaking. 

Supplemental Notice of Intent 

This Supplemental NOI highlights many of the key comments received in response 

to the September NOI, and to the Interim Joint Technical Assessment Report 

(TAR) issued by EPA, NHTSA, and the California Air Resources Board (CARB) 

associated with that Notice.2 This Supplemental NOI also discusses the agencies’ 

plans for many of the key technical analyses that will be undertaken in developing 

the upcoming proposed rulemaking. 

1 See 75 FR 62739 (October 13, 2010). 

2 For more information on the September NOI and TAR, please see “EPA and NHTSA 

Announce a First Step in the Process for Setting Future Greenhouse Gas and Fuel Economy 

Standards,” EPA-420-F-10-051); http://www.epa.gov/otaq/climate/regulations.htm or “DOT 

and EPA Announce Intent to Propose CAFE and GHG Emission Standards, 2017 and Beyond”; www.nhtsa.gov/fuel-economy

Office of Transportation and Air Quality 

EPA-420-F-10-059 

November 2010 
Regulatory Announcement 

 

In response to the September NOI and TAR, the agencies received public comments from more 

than 30 organizations and more than 100,000 individuals. In addition, EPA, NHTSA, and 

CARB met individually with the ten largest automobile original equipment manufacturers, as 

well as environmental non-governmental organizations, and representatives of state and local 

governments. The Supplemental Notice summarizes the many of the key themes that we heard 

from stakeholders, both in the public comments and in the outreach meetings. 

In the September NOI, EPA and NHTSA stated that we would continue to analyze potential 

GHG and fuel economy standards for MYs 2017-2025, both by developing and reviewing additional technical data and information, and by considering additional stakeholder input. At that 

time, we planned to update our assessment for the Supplemental NOI. However, we have not 

completed any new analyses to date, and are not updating the assessment at this time. Instead 

we will continue to conduct analyses as we move forward in developing the proposed rulemaking. Many public comments supported the agencies’ plans, noted in the September NOI, as to 

types and scope of analyses to be conducted for the proposal. Therefore, the agencies are moving 

forward with this work, and describe many of our planned key analyses in the Supplemental 

Notice. We also plan to continue working with CARB in our technical assessments of potential 

standards, and to continue extensive dialogue with stakeholders. 

The September NOI and TAR were issued in response to a May 21, 2010 Presidential Memorandum which requested EPA and NHTSA to develop a coordinated National Program to 

improve fuel efficiency and to reduce GHG emissions of light-duty vehicles for MYs 2017-2025, 

and to work with California in developing a technical assessment to inform this rulemaking. 

This program would build upon the historic success of the National Program for MYs 2012-2016 

vehicles, issued in April 2010 

Upcoming Proposed Rule 

As EPA and NHTSA proceed in developing the proposed rulemaking, we plan to continue 

our ongoing dialogue with stakeholders, and we welcome additional data and information that 

can inform our rulemaking efforts. The public dockets will remain open for the duration of 

the rulemaking. Further, EPA and NHTSA expect to continue working closely with CARB in 

developing the underlying technical assessments that will inform our future proposed standards. 

The agencies currently expect to issue a proposed rulemaking by September 30, 2011, and a final 

rulemaking by July 31, 2012. 

For More Information 

You can access the NOI and the TAR at EPA’s web site at: 

www.epa.gov/otaq/climate/regulations.htm 

or at NHTSA’s website at: 

www.nhtsa.gov/fuel-economy 

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Regulatory Announcement 

For additional information, please contact: 

EPA’s Office of Transportation and Air Quality, 

Assessment and Standards Division 

Email: ASDinfo@epa.gov 

(734) 214-4636 

or: 

NHTSA
 

Office of Chief Counsel
 

(202) 366-2992 

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