40 CFR Part 98, Table NN-2
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Fuel | Unit | Default CO2 emission factor(MT CO2/Unit) 1 |
|---|---|---|
| Natural Gas | Mscf | 0.0544 |
| Propane | Barrel | 0.241 |
| Normal butane | Barrel | 0.281 |
| Ethane | Barrel | 0.17 |
| Isobutane | Barrel | 0.27 |
| Pentanes plus | Barrel | 0.324 |
1 Conditions for emission value presented in MT CO2/bbl are 60 °F and saturation pressure.
[78 FR 71977, Nov. 29, 2013, as amended at 79 FR 3508, Jan. 22, 2014; 81 FR 89270, Dec. 9, 2016]