Regulatory Impact Analysis: Control of Emissions of Air Pollution from Category 3 Marine Diesel Engines - National Service Center for Environmental Publications (NSCEP)

Posted - January 2010
Regulatory Impact Analysis:
Control of Emissions of Air Pollution from Category 3 Marine Diesel Engines

Executive Summary
EPA is finalizing emission standards for new Category 3 marine diesel engines (engines with per cylinder displacement at or above 30 liters) installed on U.S. vessels. The standards are part of a coordinated strategy to address emissions from ocean-going vessels (OGV) A and are an important step in EPA’s ongoing National Clean Diesel Campaign (NCDC).
Emissions from OGV remain at high levels. The Category 3 engines on these vessels use emission control technology that is comparable to that used by nonroad engines in the early 1990s, and use fuel that can have a sulfur content of 30,000 ppm or more. As a result, these engines emit high levels of pollutants that contribute to unhealthy air in many areas of the U.S. As we look into the future, however, emissions from ocean-going vessels are expected to become a dominant inventory source. This will be due to both emission reductions from other mobile sources as new emission controls go into effect and to the anticipated activity growth for ocean transportation.
Our coordinated strategy to control emissions from ocean-going vessels consists of actions at both the national and international levels. It includes: (1) the engine and fuel controls we are finalizing in this action under our Clean Air Act authority; (2) the proposalB submitted by the United States Government to the International Maritime Organization to amend MARPOL Annex VI to designate U.S. coasts as an Emission Control Area (ECA)C in which all vessels, regardless of flag, would be required to meet the most stringent engine and marine fuel sulfur requirements in Annex VI; and (3) the new engine emission and fuel sulfur limits contained in the amendments to Annex VI that are applicable to all vessels regardless of flag and that are implemented in the U.S. through the Act to Prevent Pollution from Ships (APPS)...

Complete report at

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