Regulations last checked for updates: Jan 18, 2025

Title 40 - Protection of Environment last revised: Dec 30, 2025
Appendix - Table A-3 to Subpart A of Part 98—Source Category List for § 98.2(a)(1)

Table A-3 to Subpart A of Part 98—Source Category List for § 98.2(a)(1)

Source Categories a Applicable in Reporting Year 2010 and Future Years:
Electricity generation units that report CO2 mass emissions year round through 40 CFR part 75 (subpart D).
Adipic acid production (subpart E of this part).
Aluminum production (subpart F of this part).
Ammonia manufacturing (subpart G of this part).
Cement production (subpart H of this part).
HCFC-22 production (subpart O of this part).
HFC-23 destruction processes that are not collocated with a HCFC-22 production facility and that destroy more than 2.14 metric tons of HFC-23 per year (subpart O of this part).
Lime manufacturing (subpart S of this part).
Nitric acid production (subpart V of this part).
Petrochemical production (subpart X of this part).
Petroleum refineries (subpart Y of this part).
Phosphoric acid production (subpart Z of this part).
Silicon carbide production (subpart BB of this part).
Soda ash production (subpart CC of this part).
Titanium dioxide production (subpart EE of this part).
Municipal solid waste landfills that generate CH4 in amounts equivalent to 25,000 metric tons CO2e or more per year, as determined according to subpart HH of this part.
Manure management systems with combined CH4 and N2O emissions in amounts equivalent to 25,000 metric tons CO2e or more per year, as determined according to subpart JJ of this part.
Additional Source Categories a Applicable in Reporting Year 2011 and Future Years:
Electrical transmission and distribution equipment use at facilities where the total estimated emissions from fluorinated GHGs, as determined under § 98.301 (subpart DD of this part), are equivalent to 25,000 metric tons CO2e or more per year.
Underground coal mines liberating 36,500,000 actual cubic feet of CH4 or more per year (subpart FF of this part).
Geologic sequestration of carbon dioxide (subpart RR of this part).
Injection of carbon dioxide (subpart UU of this part).
Additional Source Categories a Applicable in Reporting Year 2025 and Future Years:
Geologic sequestration of carbon dioxide with enhanced oil recovery using ISO 27916 (subpart VV of this part).
Coke calciners (subpart WW of this part).
Calcium carbide production (subpart XX of this part).
Caprolactam, glyoxal, and glyoxylic acid production (subpart YY of this part).

a Source categories are defined in each applicable subpart of this part.

[75 FR 39760, July 12, 2010, as amended at 75 FR 74817, 75078, Dec. 1, 2010; 76 FR 73900, Nov. 29, 2011; 81 FR 89250, Dec. 9, 2016; 89 FR 31899, Apr. 25, 2024]
source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.