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Philadelphia Diesel Difference

Launched in 2003, the Philadelphia Diesel Difference is a public-private partnership aimed at reducing diesel pollution in the greater Philadelphia area, coordinated by AMS and the Clean Air Council including the US EPA, Pennsylvania DEP, the Delaware Valley Regional Planning Commission, and other nonprofit, private and academic partners.


Recent accomplishments include:

  • Retrofitting 78 City-owned fire trucks and 119 waste haulers with diesel oxidation catalysts (DOCs) which tailpipe reduce pollution by 20-50%.
  • Working with the Philadelphia School District to retrofit 239 school buses with DOCs and closed crankcase systems to reduce pollution in the bus cabins and protect the health of our city's school children.
  • Running an estimated 200 city-owned vehicles at 5 different fueling stations citywide on B20 biodiesel (a blend of 20% biodiesel and 80% regular diesel).
  • Retrofitting 85 pieces of equipment at Packer and Tioga terminals with DOCs to reduce tailpipe emissions. Non-road equipment such as cargo handling units can legally emit up to 10-15 times more pollution than on-highway vehicles.
  • Coordinating with the Philadelphia International Airport to install infrastructure for electrified ground service equipment.