Regulations last checked for updates: Apr 26, 2025

Title 40 - Protection of Environment last revised: Nov 26, 2025
All TitlesTitle 40Chapter IPart 98Subpart MMAppendix - Table MM-2 to Subpart MM of Part 98—Default Factors for Biomass-Based Fuels and Biomass
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Appendix - Table MM-2 to Subpart MM of Part 98—Default Factors for Biomass-Based Fuels and Biomass
Biomass-based fuel and biomass Column A:
Density
(metric tons/bbl) 		Column B: Carbon share
(% of mass) 		Column C:
Emission factor
(metric tons CO2/bbl)
Ethanol (100%)0.126752.140.2422
Biodiesel (100%, methyl ester)0.139677.300.3957
Rendered Animal Fat0.133376.190.3724
Vegetable Oil0.146076.770.4110
authority: 42 U.S.C. 7401-7671q.
source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.
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