Fact #449: December 25, 2006
Biodiesel to Conventional Diesel: An Emissions Comparison
Biodiesel is a clean-burning substitute for conventional diesel fuel that can be used in today's diesel engines. An Environmental Protection Agency study shows that emissions from B100 (100% biodiesel) and B20 (20% biodiesel/80% conventional diesel) are significantly lower than from conventional petroleum-based diesel, with the exception of nitrogen oxides (NOx).
|Emissions in relation to conventional diesel|
|Total Unburned Hydrocarbons (HC)||-67%||-20%|
|Carbon Monoxide (CO)||-48%||-12%|
|Nitrogen Oxides (NOx)||+10%||+2%|
|PAH (Polycyclic Aromatic Hydrocarbons)b||-80%||-13%|
|nPAH (Nitrated PAH's)b||-90%||-50%c|
|Ozone potential of speciated HC||-50%||-10%|
Source: Oak Ridge National Laboratory, Biomass Energy Data Book: Edition 1, ORNL/TM-2006/571, September 2006, p. 55. Original source: "A Comprehensive Analysis of Biodiesel Impacts on Exhaust Emissions."