Resources » Regulations » New Engines & Vehicles » Marine

International Maritime Organization
The international convention MARPOL 73/78, Annex VI, limiting NOx emission from ships, can be ordered from IMO Publications.
US EPA Diesel Boats and Ships
Includes US marine emission regulations, support documents, fact sheets and more.
US EPA Oceangoing Vessels
US marine emission regulations for oceangoing ships (Category 3 engines).
US EPA Gasoline Boats and Personal Watercraft
US marine emission regulations for spark ignited engines.