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National Clean Diesel Campaign (NCDC)

Working Together for Cleaner Air

Basic Information

National Clean Diesel Campaign

EPA’s National Clean Diesel Campaign (NCDC) promotes clean air strategies by working with manufacturers, fleet operators, air quality professionals, environmental and community organizations, and state and local officials to reduce diesel emissions.

As a result of EPA regulations, diesel engines manufactured today are cleaner than ever. Recent diesel rulemakings have focused on light- and heavy-duty highway vehicles, nonroad diesel equipment, locomotive and marine engines, and large ocean-going vessels.

Reducing Emissions From Existing Diesel Engines

Because diesel engines can operate for 20 to 30 years, millions of older, dirtier diesel engines are still in use. EPA offers many strategies and programs to help make these engines operate more cleanly, and funding to help build diesel emission reduction programs that improve air quality and protect public health. EPA recommends a wide range of emission reduction strategies for diesel vehicles, vessels, locomotives, or equipment. These include:

Clean Diesel Funding

As part of the Energy Policy Act of 2005 (551 pp, 1.3MB), the Diesel Emissions Reduction Act (DERA) authorizes funding of up to $100 million annually for FY2012 through FY2016 to help fleet owners reduce diesel emissions. Current programs are:

  • The National Clean Diesel Funding Assistance Program awards competitive grants to fund projects that implement EPA or CARB verified and certified diesel emission reduction technologies.
  • State Clean Diesel Grant Program allocates funds to participating states to implement grant and loan programs for clean diesel projects. Base funding is distributed to states using a specific formula based on participation, and incentive funding is available for any states that match their base funding. Currently all 50 States and the District of Columbia are participating.

Impacts of Diesel Emissions

Human health, environment, and global climate are all impacted by diesel emissions.(Air Pollution (PDF) (5 pp, 900K, About PDF)

  • Human Health - Emissions from diesel exhaust can lead to serious health conditions like asthma and allergies, and can worsen heart and lung disease, especially in vulnerable populations such as children and the elderly.
  • Environment - Diesel engines emit particulate matter (soot); nitrogen oxides which contribute to the production of ground-level ozone (smog) and acid rain; hydrocarbons; air toxics; and black carbon . These emissions can damage plants, animals, crops, and water resources.
  • Global Climate - Climate change affects air quality, weather patterns, sea level, ecosystems, and agriculture. Reducing greenhouse gas (GHG) emissions from diesel engines through improved fuel economy or idle reduction strategies can help address climate change, improve our nation's energy security, and strengthen our economy.
  • Environmental Justice - Minority and disadvantaged populations may receive disproportionate impacts from diesel emissions. Activities of the National Clean Diesel Campaign further EPA’s commitment to reduce health and environmental harm from diesel emissions in all communities throughout the country.

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