U.S. Code of Federal Regulations

Regulations most recently checked for updates: May 25, 2025

All TitlesTitle 40Chapter IPart 63Subpart DDDDD - Subpart DDDDD—National Emission Standards for Hazardous Air Pollutants for Major Sources: Industrial, Commercial, and Institutional Boilers and Process Heaters

WHAT THIS SUBPART COVERS
§ 63.7480 - What is the purpose of this subpart?
§ 63.7485 - Am I subject to this subpart?
§ 63.7490 - What is the affected source of this subpart?
§ 63.7491 - Are any boilers or process heaters not subject to this subpart?
§ 63.7495 - When do I have to comply with this subpart?

EMISSION LIMITATIONS AND WORK PRACTICE STANDARDS
§ 63.7499 - What are the subcategories of boilers and process heaters?
§ 63.7500 - What emission limitations, work practice standards, and operating limits must I meet?
§ 63.7501 - [Reserved]

GENERAL COMPLIANCE REQUIREMENTS
§ 63.7505 - What are my general requirements for complying with this subpart?

TESTING, FUEL ANALYSES, AND INITIAL COMPLIANCE REQUIREMENTS
§ 63.7510 - What are my initial compliance requirements and by what date must I conduct them?
§ 63.7515 - When must I conduct subsequent performance tests, fuel analyses, or tune-ups?
§ 63.7520 - What stack tests and procedures must I use?
§ 63.7521 - What fuel analyses, fuel specification, and procedures must I use?
§ 63.7522 - Can I use emissions averaging to comply with this subpart?
§ 63.7525 - What are my monitoring, installation, operation, and maintenance requirements?
§ 63.7530 - How do I demonstrate initial compliance with the emission limitations, fuel specifications and work practice standards?
§ 63.7533 - Can I use efficiency credits earned from implementation of energy conservation measures to comply with this subpart?

CONTINUOUS COMPLIANCE REQUIREMENTS
§ 63.7535 - Is there a minimum amount of monitoring data I must obtain?
§ 63.7540 - How do I demonstrate continuous compliance with the emission limitations, fuel specifications and work practice standards?
§ 63.7541 - How do I demonstrate continuous compliance under the emissions averaging provision?

NOTIFICATION, REPORTS, AND RECORDS
§ 63.7545 - What notifications must I submit and when?
§ 63.7550 - What reports must I submit and when?
§ 63.7555 - What records must I keep?
§ 63.7560 - In what form and how long must I keep my records?

OTHER REQUIREMENTS AND INFORMATION
§ 63.7565 - What parts of the General Provisions apply to me?
§ 63.7570 - Who implements and enforces this subpart?
§ 63.7575 - What definitions apply to this subpart?
Appendix - Table 1 to Subpart DDDDD of Part 63—Emission Limits for New or Reconstructed Boilers and Process Heaters c
Appendix - Table 2 to Subpart DDDDD of Part 63—Emission Limits for Existing Boilers and Process Heaters d
Appendix - Table 3 to Subpart DDDDD of Part 63—Work Practice Standards
Appendix - Table 4 to Subpart DDDDD of Part 63—Operating Limits for Boilers and Process Heaters
Appendix - Table 5 to Subpart DDDDD of Part 63—Performance Testing Requirements
Appendix - Table 6 to Subpart DDDDD of Part 63—Fuel Analysis Requirements
Appendix - Table 7 to Subpart DDDDD of Part 63—Establishing Operating Limits a b
Appendix - Table 8 to Subpart DDDDD of Part 63—Demonstrating Continuous Compliance
Appendix - Table 9 to Subpart DDDDD of Part 63—Reporting Requirements
Appendix - Table 10 to Subpart DDDDD of Part 63—Applicability of General Provisions to Subpart DDDDD
Appendix - Table 11 to Subpart DDDDD of Part 63—Alternative Emission Limits for New or Reconstructed Boilers and Process Heaters That Commenced Construction or Reconstruction After June 4, 2010, and Before May 20, 2011
Appendix - Table 12 to Subpart DDDDD of Part 63—Alternative Emission Limits for New or Reconstructed Boilers and Process Heaters That Commenced Construction or Reconstruction After May 20, 2011, and Before December 23, 2011
Appendix - Table 13 to Subpart DDDDD of Part 63—Alternative Emission Limits for New or Reconstructed Boilers and Process Heaters That Commenced Construction or Reconstruction After December 23, 2011, and Before April 1, 2013
Appendix - Table 14 to Subpart DDDDD of Part 63—Alternative Emission Limits for New or Reconstructed Boilers and Process Heaters c
Appendix - Table 15 to Subpart DDDDD of Part 63—Alternative Emission Limits for Existing Boilers and Process Heaters d
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