An official website of the United States government.

We've made some changes to 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

Amendments Related to Marine Diesel Engine Emission Standards – Proposal

On this page:

Rule Summary

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

EPA proposes to amend the national marine diesel engine program to provide relief provisions to address concerns associated with finding and installing certified Tier 4 marine diesel engines in certain high-speed commercial vessels. The proposed relief is in the form of additional lead time for qualifying engines and vessels. The proposal also includes waiver provisions to allow for continued installation of Tier 3 engines for certain vessels if suitable Tier 4 engines continue to be unavailable. We are also proposing adjustments to the requirements for certifying marine diesel engines, especially as it relates to demonstrating the durability of emission controls, to promote certification of engines with high power density.

EPA is also making a technical correction to the diesel fuel regulations to allow U.S. fuel manufacturers and distributors to sell distillate diesel fuel that complies with the global sulfur standard that applies internationally instead of the fuel standards that otherwise apply to distillate diesel fuel in the United States. Please see the separate final rule for this action here.

Additional Resources

Fact Sheets:

Regulations for Emissions from Vehicles and Engines Home