On this page:

• Rule Summary
• Rule History
• Additional Resources
• Compliance

Rule Summary

The final rule establishes the Tier 3 Motor Vehicle Emission and Fuel Standards program. The Tier 3 program is part of a comprehensive approach to reducing the impacts of motor vehicles on air quality and public health. The program considers the vehicle and its fuel as an integrated system, setting new vehicle emissions standards and a new gasoline sulfur standard beginning in 2017. The vehicle emissions standards will reduce both tailpipe and evaporative emissions from passenger cars, light-duty trucks, medium-duty passenger vehicles, and some heavy-duty vehicles. The gasoline sulfur standard will enable more stringent vehicle emissions standards and will make emissions control systems more effective.

• Final Rule (PDF)(474 pp, 6.6MB, published April 28, 2014)
• Regulatory Impact Analysis (PDF)(619 pp, 15 MB, EPA-420-R-14-005, February 2014)
• Summary and Analysis of Comments (PDF)(982 pp, 6 MB, EPA-420-R-14-004, February 2014)

Rule History

• Proposed Rule and Related Materials
• Amendments Related to Tier 3 Motor Vehicle Emission and Fuel Standards (February 2015)

Additional Resources

Fact Sheet

• EPA Sets Tier 3 Motor Vehicle Emission and Fuel Standards (PDF)(5 pp, 176 K, EPA-420-F-14-009, March 2014)
• EPA Sets Tier 3 Tailpipe and Evaporative Emission and Vehicle Fuel Standards (PDF)(5 pp, 176 K, EPA-420-F-14-008, March 2014)
• Tier 3 Gasoline Sulfur Standard’s Impact on Gasoline Refining (PDF)(4 pp, 176 K, EPA-420-F-14-007, March 2014)
• EPA Sets Tier 3 Motor Vehicle Emission and Fuel Standards, Strengthens Clean Cars Program (PDF)(2 pp, 143 K, EPA-420-F-14-010, March 2014)

Technical Support Document

• Emissions Modeling: Tier 3 Motor Vehicle Emission and Standards (PDF)(118 pp, EPA-454-R-14-003, February 2014)
• Air Quality Modeling:Tier 3 Motor Vehicle Emission and Standards (PDF)(128 pp, 12 MB, EPA-454-R-14-002, February 2014)

Other

• EPA Tier 3 Emissions - Averaging, Banking & Trading (AB&T) Reporting Templates
  • EPA Tier 3 Light-Duty FTP and SFTP AB&T Reporting Templates (XLSM)(822 K, September 2018)
  • EPA Tier 3 Heavy-Duty Vehicle NMOG+NOx, Evaporative and Cold NMHC AB&T Templates (XLSM)(900 K, September 2018)
• Calculator for MY2015-2017 Early Tier 3 Credits (XLS)(708 K, November 2016)
• Manufacturer Tier 3 Questions and EPA Answers
• EPA Webinar Slides on Tier 3 Gasoline Sulfur Regulations

Compliance

• Small Business Advocacy Review Panel: Control of Air Pollution from Motor Vehicles: Tier 3 Motor Vehicle Emission and Fuel Standards