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Colorado Clean Diesel Program


School Bus
School Bus Retrofits at No Cost to School Districts!

Diesel Emissions and Health

Diesel exhaust contributes to respiratory and cardiovascular diseases, including lung cancer. Toxic emissions from diesel school bus tailpipes and crankcases pollute bus interiors as well as outdoor air. Bus riders and drivers may be exposed to these pollutants for extended periods. Children with their developing lungs and higher respiratory rates are especially vulnerable.


Clean Diesel Retrofit

To reduce toxics exposures, the Colorado Clean Diesel Program retrofits school buses with proven emissions reduction technologies, including diesel oxidation catalysts, engine pre-heaters, and closed crankcase filtration systems. Using engine pre-heaters, for example, results in greatly-reduced engine idling, which also saves fuel.


Diesel engine experts from CDPHE's Air Pollution Control Division provide follow-up service to ensure that emissions reduction equipment is working properly.


Funding and Program Availability

Program funding is mainly from the U.S. Environmental Protection Agency via Congress’s
Diesel Emission Reduction Act (DERA).


Retrofit services are provided to school districts depending on several criteria:

(1) funding availability;

(2) local air quality issues;

(3) vehicle age and configuration; and

(4) the Air Pollution Control Division's resources.


CDPHE's Air Pollution Control Division provides idling reduction information and tools to fleet management staff, as well as to students and parent-teacher organizations if desired.


How to Enroll

Interested school districts should e-mail the following information to Garry Kaufman

  • School District Name and Number
  • Colorado County
  • Superintendent Name
  • Transportation/Fleet Manager Name
  • Street Address (Administration)
  • City or Town, Zip Code
  • Street Address of Bus Depot


School Districts enrolling in the program are also asked to fill out the information in the following Excel spreadsheet and e-mail the document to Garry Kaufman


For additional information about the Colorado Clean Diesel program,
please contact Garry Kaufman ( 303-692-3269 / garrison.kaufman@state.co.us ).