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National Clean Diesel Campaign (NCDC)

Working Together for Cleaner Air

Tools & Resources

Contact Clean Diesel

Questions regarding grants, technologies, application procedures? Call or e-mail:

Implementing Clean Diesel Activities

Diesel Emissions Quantifier

The Diesel Emissions Quantifier (Quantifier) is an interactive tool that can help evaluate clean diesel projects by estimating emission reductions, cost effectiveness, and health benefits.

State and Local Toolkit

The State and Local Toolkit contains information and examples designed to help state, regional, and local governments improve air quality and public health through diesel engine emission reduction efforts, particularly for those states and localities participating in the National Clean Diesel Campaign (NCDC) State Grant Program and/or the National Clean Diesel Funding Assistance Program.

Regional Clean Diesel Collaboratives

The Clean Diesel Collaboratives are public-private partnerships working to improve air quality by reducing diesel emissions through projects that use innovations in diesel technologies, operational strategies and alternative/renewable fuels.

They include EPA regional offices as well as equipment manufacturers, fleet owners, state and local governments, and non-profit organizations. Working together allows members to leverage funding and share technology and professional expertise.

Regulatory Standards

EPA is devoting significant efforts to ensuring the successful implementation of cleaner standards for diesel fuel and new diesel engines. These standards are the critical foundation of EPA’s diesel control program.

Beginning June 1, 2006, refiners began producing ultra-low sulfur diesel fuel with sulfur levels at or below 15 parts per million (ppm) for use in heavy duty highway diesel engines. Nonroad diesel engines were required to use low sulfur (500 ppm) diesel fuel beginning in 2007 and ultra-low sulfur diesel fuel beginning in 2010.

Locomotives and smaller marine engines required low sulfur (500 ppm) diesel fuel beginning in 2007 and ultra-low sulfur diesel fuel beginning in 2012. In addition, emission standard for large commercial marine diesel vessels like cruise and container ships will be phased in beginning in 2011.

In addition to reducing emissions from existing diesel fleets, these cleaner fuels enable the use of advanced after-treatment technologies on new engines. Technologies like particulate traps, capable of emission reductions of 90% and more, are required under new standards which began phasing in for the highway sector in 2007, and will begin taking effect in the nonroad sector in 2010.

These programs will yield enormous long-term benefits for public health and the environment. By 2030, when the engine fleet has been fully turned over, particulate matter (PM) and nitrous oxides (NOx) will be reduced by 380,000 tons/year and 7 million tons/year, respectively. This will result in annual benefits of over $290 billion, at a cost of approximately $15 billion.

Together these programs will yield enormous long-term benefits for public health and the environment. Learn more about the heavy duty diesel engine and fuel regulatory programs and emissions standards.

Rules Exhaust Emission Standards
2007 Highway Rule Highway - Compression Ignition (CI) engines and urban buses
Medium and Heavy Duty Green House Gases Rule (Proposed) not yet available
Nonroad Diesel Rule Non-road - Compression Ignition (CI) engines
Locomotives Locomotives
Diesel Boats & Ships Marine Compression-Ignition (CI) Engines
Ocean Going Vessels & Large Ships Marine Compression-Ignition (CI) Engines
Diesel Fuel Highway, Nonroad, Locomotive, and Marine Diesel Fuel Sulfur

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