Across the United States, diesel retrofit programs and demonstration projects have grown significantly over the past several years. These programs and projects demonstrate the applicability and feasibility of EPA and/or California Air Resources Board verified (or certified) pollution reduction retrofit technologies and fuels for both on-road and off-road vehicles and equipment.

In conjunction with state and local governments, public interest groups, and industry partners, EPA has established a goal of reducing emissions from the over 11 million diesel engines in the existing fleet by 2014.

Below are links to past, current, and upcoming diesel retrofit programs/demonstration projects in the U.S. (Note: List will be updated periodically.)

• U.S. EPA
  • 2004 Voluntary Diesel Retrofit Program Funded Projects
  • Region 1 - School Buses
  • Region 1 - Retrofit Projects
  • Clean Buses for Kids Program
• California ARB
  • FY 2004-05 Carl Moyer Program Multi-District Projects
  • The Port of Los Angeles Diesel Oxidation Catalyst Program
  • Demonstation of Particulate Trap Technologies on Existing Off-Road Heavy-Duty Construction Equipment
• West Coast Collaborative
  • Projects
• New Jersey
  • Assembly Bill 3182 - Proposed bill requiring the use of diesel retrofit controls on diesel-powered public vehicles operating in the state
• New York
  • New York City Local Law No. 77 - City ordinance requiring city-owned and contracted diesel-powered nonroad vehicles use ULSD and best available technology
  • New York City Introductory No. 414-A - Bill requiring the city to purchase the lowest emitting light- or medium-duty vehicle available that meets the requirements for the city's intended use
  • New York City Introductory No. 415-A - Bill requiring the city's on-road diesel vehicles to use ULSD and either retrofit with best available technology or replace with newer models
  • New York City Introductory No. 416-A - Bill extending the ULSD and emission control requirements to vehicles used in fulfilling solid waste and recycling contracts
  • New York City Introductory No. 417-A - Bill calling for licensed sightseeing companies to install best available technology on their buses or replace with newer models
  • New York City Introductory No. 428-A - Bill requiring buses used to transport public school students to use ULSD and best available technology
• Pennsylvania
  • Wissahickon School District Diesel Retrofit Initiative
• Texas
  • FY02-04 TERP Projects Selected for Funding
• Washington
  • List of Current Projects in Washington that Reduce Diesel Particles
  • Clean School Bus Program Projects