Heavy-Duty Engine and Vehicle Omnibus Regulation Amendments

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This page last reviewed May 31, 2024

Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation

Hearing Date(s)

October 20, 2023

Public Comments Received

CARB Submitted a Request for Waiver Action Pursuant to Clean Air Act Section 209(e) for the “Omnibus” Low NOx Regulation, as Amended in 2023

CARB's Request for Waiver Action Pursuant to Clean Air Act Section 209(e)

Clean Air Act Section 209(e) Authorization Request Support Document

OAL approved the rulemaking and filed with Secretary of State on May 31, 2024. The effective date is May 31, 2024.

Attachment A-1: Final Regulation Order

Alternate Format to the Final Regulation Order: Attachment A-2 ~Microsoft Word document version of document posted directly above~

Attachment B-1: Final Modifications to the Diesel Engine Test Procedures

Alternate Format to the Diesel Engine Test Procedures: Attachment B-2 ~Microsoft Word document version of document posted directly above~

Attachment C-1: Final Modifications to the Otto-Cycle Engine Test Procedures

Alternate Format to the Otto-Cycle Engine Test Procedures: Attachment C-2 ~Microsoft Word document version of document posted directly above~

Addendum to the Final Statement of Reasons

Updated Informative Digest

The final rulemaking package was submitted to OAL on April 18, 2024. OAL has until May 31, 2024, to make a final determination.

Attachment A-1: Final Regulation Order (See Revised Above)

Alternate Format to the Final Regulation Order: Attachment A-2 ~Microsoft Word document version of document posted directly above (See Revised Above)~

Attachment B-1: Final Modifications to the Diesel Engine Test Procedures (See Revised Above)

Alternate Format to the Diesel Engine Test Procedures: Attachment B-2 ~Microsoft Word document version of document posted directly above (See Revised Above)~

Attachment C-1: Final Modifications to the Otto-Cycle Engine Test Procedures (See Revised Above)

Alternate Format to the Otto-Cycle Engine Test Procedures: Attachment C-2 ~Microsoft Word document version of document posted directly above (See Revised Above)~

Final Statement of Reasons

Updated Informative Digest (See Revised Above)

Request for an Early Effective Date

Notice of Exemption

On December 28, 2023, CARB approved the Executive Order adopting the Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation. CARB will file the final rulemaking documents with OAL (including the FSOR) when those documents are ready for submittal.

Posted December 28, 2023

Executive Order

Posted December 6, 2023

Notice of Public Availability of Modified Text (Deadline to Comment: December 21, 2023)

Appendix A-1: Proposed 15-Day Changes to Proposed Regulation Order (15-Day Changes Available for Comment)

Appendix A-2 ~Alternate Format to Appendix A-1~

Appendix A-3 ~Alternate Version~

Appendix B-1: Proposed 15-Day Changes to Proposed Modifications to the Diesel Engine Test Procedures (15-Day Changes Available for Comment)

Appendix B-2 ~Alternate Format to Appendix B-1~

Appendix B-3 ~Alternate Version~

Appendix C-1: Proposed 15-Day Changes to the Otto-Cycle Engine Test Procedures (15-Day Changes Available for Comment)

Appendix C-2 ~Alternate Format to Appendix C-1~

Posted September 15, 2023

Notice of Executive Officer Hearing

Posted August 1, 2023

Notice of Public Hearing (Deadline to Submit Public Comments: September 18, 2023)

Staff Report: Initial Statement of Reasons (ISOR)

Appendix A-1: Proposed Regulation Order

Appendix A-2: Proposed Regulation Order ~Alternative format to Appendix A-1~

Appendix B-1: Proposed Modifications to the Diesel Engine Test Procedures

Appendix B-2: Proposed Modifications to the Diesel Engine Test Procedures ~Alternative format to Appendix B-1~

Appendix C: Purpose and Rationale for Each Regulatory Provision

More Information

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