DEEP: Clean Diesel Projects and Programs

Clean Diesel Projects and Programs

Exhaust from diesel engines is a significant contributor to air pollution. It has been classified as "likely to be carcinogenic" by EPA and the California Air Resources Board has included particulate emissions from diesel vehicles on its list of Toxic Air Contaminants.

DEEP's initial clean diesel efforts prioritized the installation of emission controls on school buses because of health risks posed to children by diesel exhaust. A variety of funding {Norwich School Bus} sources were leveraged to reduce childrenís exposure to fine particulate matter in diesel exhaust, which can aggravate asthma, bronchitis and other cardiovascular conditions. Connecticutís school bus retrofit programs are detailed on the Connecticut Clean School Bus Program web page.

With increased funding available from the federal Diesel Emission Reduction Act (DERA) through EPAís National Clean Diesel Campaign and the State Grants & Funding Program, DEEP has broadened the scope of our efforts to capitalize on these retrofit, repower, replacement and idle reduction opportunities for construction, fleet and marine applications. DERA funding is also covering diesel emission reduction projects for transit, locomotives and port operations.

Other projects to reduce diesel emissions have been made possible through the U.S. Department of Energyís Clean Cities Program.  The Clean Cities Coalitions in Connecticut have advanced the use of alternative fuels and fueling infrastructure in the state, which effectively decreases emissions from both gasoline and diesel-powered vehicles.  The Connecticut Department of Transportation also works with agencies and planning organizations to reduce diesel emissions using the Federal Highway Administrationís Congestion Mitigation Air Quality program.

DEEPís diesel grants and funding efforts since 2008 have leveraged over $5 million from the state and national DERA, the federal American Recovery and Reinvestment Act (aka Stimulus Act) and the Connecticut Clean School Bus Act to reduce diesel emissions that impact both the environment and the passengers on these vehicles.

Diesel Reduction Efforts in Connecticut*




 Locomotives & Ports

CT Transit Bus Replacement (PDF 208 KB)

ConnDOT Construction Retrofits

SEP-Funded Diesel Replacement Program ConnDOT Chester/Hadlyme River Ferry Repower Project

EPA Region 1 -Clean Transit Bus Projects -Hartford, Stamford, Preston, Hamden, Danbury, Bridgeport (PDF 1.48 MB)

Fairfield Municipal Vehicle Retrofit Project

Enviro Express CNG Truck Replacement Project

Tugboat Gotham Engine Replacement Project


DEEP Maintenance Fleet Retrofit Project

ConnDOT Dump Truck Retrofits (PDF 203 KB)

Cross Sound Ferry Engine Upgrade Project


NESCAUM Leased Construction Equipment Retrofit Project

Connecticut Clean Cities Future Fuels Project to promote alternative-fuel vehicles & fleets

Port of New Haven Truck Stop Electrification


New Haven School Construction Retrofits

CT DOTís Connecticut Clean Fuel Program for alternative/clean fuel vehicles

NESCAUM Locomotive APU Project


I-95 New Haven Harbor Crossing -CT Clean Air Construction Initiative

Trumbull Clean Trash Trucks  

NESCAUM Switch Engine Repower in New Haven


Town of Fairfield Natural Gas Vehicles and Refueling Infrastructure (PDF 0.2 MB)


CRRA:  Hartford Landfill and City of Hartford Trash Trucks (PDF 9 KB)

*The Connecticut Clean School Bus Program webpage covers the school bus retrofit programs.  Articles containing additional information on clean school bus projects in Connecticut are also available.

Content Last Updated on June 27, 2013