1. Regulations
  2. title 40
  3. chapter I-i22
  4. part 98
  5. subpart C
  6. appendix-i 1

- Table C-2 to Subpart C of Part 98—Default CH4 and N2O Emission Factors for Various Types of Fuel

Fuel type Default CH4 emission factor (kg CH4/mmBtu) Default N2O emission factor (kg N2O/mmBtu) Coal and Coke (All fuel types in Table C-1)1.1 × 10−021.6 × 10−03Natural Gas 11.0 × 10− 031.0 × 10− 04Petroleum Products (All fuel types in Table C-1)3.0 × 10−036.0 × 10−04Fuel Gas3.0 × 10−036.0 × 10−04Other Fuels—Solid3.2 × 10−024.2 × 10−03Blast Furnace Gas2.2 × 10−051.0 × 10−04Coke Oven Gas4.8 × 10−041.0 × 10−04Biomass Fuels—Solid (All fuel types in Table C-1, except wood and wood residuals)3.2 × 10−024.2 × 10−03Wood and wood residuals7.2 × 10−033.6 × 10−03Biomass Fuels—Gaseous (All fuel types in Table C-1)3.2 × 10−036.3 × 10−04Biomass Fuels—Liquid (All fuel types in Table C-1)1.1 × 10−031.1 × 10−04

Note: Those employing this table are assumed to fall under the IPCC definitions of the “Energy Industry” or “Manufacturing Industries and Construction”. In all fuels except for coal the values for these two categories are identical. For coal combustion, those who fall within the IPCC “Energy Industry” category may employ a value of 1g of CH4/mmBtu.

1 Reporters subject to subpart W of this part may only use the default CH4 emission factor for natural gas-fired combustion units that are not reciprocating internal combustion engines or gas turbines. For natural gas-fired reciprocating internal combustion engines or gas turbines, at facilities subject to subpart W of this part, reporters must use a CH4 emission factor determined in accordance with § 98.233(z)(4).

[78 FR 71952, Nov. 29, 2013, as amended at 81 FR 89252, Dec. 9, 2016; 89 FR 42220, May 14, 2024]

AUTHORITY: 42 U.S.C. 7401-7671q.

SOURCE: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.