Clean Diesel School Bus Retrofit Program

Provided at no cost to school districts
  • To reduce exposure to diesel exhaust by retrofitting school buses with proven emissions-reduction technologies, including diesel-oxidation catalysts, engine preheaters and closed-crankcase filtration systems. 
How to enroll
1.  Document the following information:
  • School district name and number.
  • County.
  • Superintendent name.
  • Transportation/fleet manager name.
  • Street address (administration).
  • City or town, ZIP code.
  • Street address of bus depot.
Fill out the Excel spreadsheet:
2.  Email the information or the document to:
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. 
About the program
  • APCD diesel engine experts work with selected contractors to retrofit school buses with emission-reduction technologies.
  • These technologies are designed to reduce emissions and engine idling and can result in significant emissions reductions and cost savings.
    • Ex: Engine preheaters greatly reduce engine idling, which also saves fuel.
  • Once installed, APCD experts provide follow-up service to school districts to ensure emissions-reduction equipment is working properly.
  • APCD also provides idling reduction information and tools to fleet management staff, as well as to students and parent-teacher organizations, if desired.
We provide retrofit services to school districts depending on:
  • Funding availability.
  • Local air quality issues.
  • Vehicle age and configuration.
  • The Air Pollution Control Division's resources.
Progress of retrofits
Completed retrofits map
Program funding
Program funding comes mainly from the U.S. Environmental Protection Agency via Congress’ Diesel Emission Reduction Act (DERA).