An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Regulations for Emissions from Vehicles and Engines

Final Rule for Control of Emissions of Air Pollution From Locomotive Engines and Marine Compression-Ignition Engines Less Than 30 Liters per Cylinder

Rule Summary

The U.S. Environmental Protection Agency (EPA) is adopting standards that will dramatically reduce emissions of diesel particulate matter (PM) and oxides of nitrogen (NOx) from locomotives and marine diesel engines. This three-part program aims to (1) Tighten emission standards for existing locomotives and large marine diesel engines when they are remanufactured; (2) Set near-term engine-out emissions standards, referred to as Tier 3 standards, for newly-built locomotives and marine diesel engines; and (3) Set longer-term standards, referred to as Tier 4 standards, for newly-built locomotives and marine diesel engines that reflect the application of high-efficiency aftertreatment technology.

Referenced Tier Levels

Marine CI Engines:
  • Tier 3
  • Tier 4
 
Locomotive Engines:
  • Tier 0
  • Tier 1
  • Tier 2
  • Tier 3
  • Tier 4

Rule History

 

Additional Resources

Fact Sheet

Technical Highlights

Regulations for Emissions from Vehicles and Engines Home