On-Road Vehicles

Roughly 34% of diesel exhaust in the Puget Sound region comes from on-road diesel engines, which include light-duty trucks and personal cars; medium-duty vans and small buses; and heavy-duty vehicles, such as trucks, buses, and waste haulers.

We help fleets reduce diesel emissions from on-road engines through:Graph of diesel emission sources.

  • Best practices
  • Cleaner fuels
  • Retrofit technologies (exhaust and crankcase retrofits and preheaters)
  • Vehicle replacements

*Note: For emissions inventory purposes, our agency includes cargo-handling equipment in the maritime sector and not in the off-road sector.

  1. Scrappage & Retrofits
  2. Public & Private Fleets
  3. School Bus Retrofit
  4. Diesel Electric Hybrids
  5. Waste-Hauling Trucks

Scrappage & Retrofits for Air in Puget Sound (SCRAPS) Program

  • Description: Scrap old, dirty, heavy-duty diesel trucks working in Port of Seattle and replace them with newer, cleaner trucks
  • Clean Air Strategies: New trucks and diesel oxidation catalysts
  • Air Pollution Reductions:
    • PM2.5: 5 tons per year
    • NOx: 78 tons per year
  • Project Period: November 2009 through January 2011
  • Funding:
    • $1,500,000 - Port of Seattle
    • $350,000 - Washington Department of Ecology
  • Project Manager: Beth Carper