StacksVerified U.S. regulatory reference

40 CFR Part 98, Table A-4

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov

Source Categories a Applicable in Reporting Year 2010 and Future Years:

Ferroalloy production (subpart K of this part).

Glass production (subpart N of this part).

Hydrogen production (subpart P of this part).

Iron and steel production (subpart Q of this part).

Lead production (subpart R of this part).

Pulp and paper manufacturing (subpart AA of this part).

Zinc production (subpart GG of this part).

Additional Source Categories a Applicable in Reporting Year 2011 and Future Years:

Electronics manufacturing (subpart I of this part).

Fluorinated gas production (subpart L of this part).

Magnesium production (subpart T of this part).

Petroleum and Natural Gas Systems (subpart W of this part).

Industrial wastewater treatment (subpart II of this part).

Electrical transmission and distribution equipment manufacture or refurbishment, as determined under § 98.451 (subpart SS of this part).

Industrial waste landfills (subpart TT of this part).

Additional Source Categories a Applicable in Reporting Year 2025 and Future Years:

Ceramics manufacturing facilities, as determined under § 98.520 (subpart ZZ of this part).

a Source categories are defined in each applicable subpart.

[75 FR 39760, July 12, 2010, as amended at 75 FR 74488, Nov. 30, 2010; 75 FR 74817, Dec. 1, 2010; 81 FR 89250, Dec. 9, 2016; 89 FR 31899, Apr. 25, 2024]