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National Clean Diesel Campaign (NCDC)

Working Together for Cleaner Air


Biodiesel: Diesel fuel oil modified with 0 to 100% biologically derived oils. The use of biodiesel fuel is one recognized retrofit technology used to reduce diesel engine emissions. Emission reduction information is provided below.

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Biodiesel Fuel Emission Reductions
Technology Engine
Biodiesel Highway, heavy duty, 2 & 4 cycle 0 to 47 0 to -10 0 to 67 0 to 47


  • Reductions for all pollutants must be calculated for a particular biodiesel fuel. Download this biodiesel reduction spreadsheet (XLS) (40K, May 2007) calculation file to use to determine reductions.
  • A negative value in the table above indicates an increase in that pollutant.
  • There are no data on biodiesel effects on engine durability, materials compatibility, fuel storage stability, lubricity, biodiesel production feedstocks or costs, cold flow properties, cost, renewability/full fuel lifecycle emissions.
  • There is a slight fuel economy penalty with biodiesel use. An approximate fuel penalty calculation can be made with calculation worksheets above.
  • Biodiesel fuel is composed of mono-alkyl esters of long chain fatty acids derived from vegetable oils or animal fats meeting the requirements of American Society of Testing and Materials (ASTM) D 6751.
  • A biodiesel blend is a mix of biodiesel fuel meeting ASTM D 6751 with petroleum-based diesel fuel, and designated BXX, where XX represents the volume percentage of biodiesel fuel in the mix.
  • EPA does not endorse the use of any particular company's product.

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