WTO notification · TBT
United StatesIn force, according to its latest notice
Official title
Proposed Amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus, Low Carbon Fuel Standard Regulations, and to Permanently Adopt the Emergency Vehicle Emissions Regulations
The United States issued an addendum on 8 July 2026 to the earlier TBT notification G/TBT/N/USA/2036. Addenda often report that a measure was adopted, changed, postponed or withdrawn. The measure was first notified on 17 August 2023. The comment period closed on 15 July 2026.
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Heavy-duty engines; Environmental protection; Air quality; Special purpose vehicles
Latest notice (G/TBT/N/USA/2036/Rev.1/Add.6, 8 July 2026)
The latest notice says the measure has entered into force.
Second Notice of Public Availability of Modified Text and Availability of Additional Documents and Information for the Proposal to Permanently Adopt the Emergency Vehicle Emissions Regulations
At its 26 March 2026 public hearing, the California Air Resources Board (CARB) approved the permanent adoption of the Emergency Vehicle Emissions Regulations adopted via emergency rulemaking, which became effective on 2 October 2025. The Board approved for permanent adoption the proposed sections 1900, 1956.8, 1961.2, 1961.3, 1962.2, 1962.3, 1965, 1968.2, 1968.5, 1969, 1971.1, 1971.5, 1976, 1978, 2035, 2036, 2037, 2038, 2040, 2111, 2112, 2113, 2114, 2115, 2116, 2117, 2118, 2119, 2121, 2123, 2125, 2126, 2127, 2128, 2129, 2130, 2131, 2133, 2137, 2139, 2139.5, 2140, 2141, 2142, 2143, 2144, 2145, 2146, 2147, 2148, 2149, 2166, 2166.1, 2167, 2168, 2169, 2169.1, 2169.2, 2169.3, 2169.4, 2169.5, 2169.6, 2169.7, 2169.8, 2170, 2317, 2423, 2485, 2903, 1900.0.1, 1956.8.1, 1961.2.1, 1961.3.1, 1962.2.1, 1962.3.1, 1965.0.1, 1968.2.1, 1968.5.1, 1969.0.1, 1971.1.1, 1971.5.1, 1976.0.1, 1978.0.1, 2035.0.1, 2036.0.1, 2037.0.1, 2038.0.1, 2040.0.1, 2111.0.1, 2112.0.1, 2113.0.1, 2114.0.1, 2115.0.1, 2116.0.1, 2117.0.1, 2118.0.1, 2119.0.1, 2121.0.1, 2123.0.1, 2125.0.1, 2126.0.1, 2127.0.1, 2128.0.1, 2129.0.1, 2130.0.1, 2131.0.1, 2133.0.1, 2137.0.1, 2139.0.1, 2140.0.1, 2141.0.1, 2142.0.1, 2143.0.1, 2144.0.1, 2145.0.1, 2146.0.1, 2147.0.1, 2148.0.1, 2149.0.1, 2317.0.1, 2423.0.1, 2485.0.1, and 2903.0.1, Title 13, California Code of Regulations (CCR); sections 95300, 95301, 95302, 95303, 95304, 95305, 95306, 95307, 95308, 95309, 95310, 95311, 95312, 95660, 95661, 95662, 95663, 95664, 95300.0.1, 95301.0.1…
The proposal for the On-Road Heavy-Duty Engine and Vehicle Omnibus regulation (called 'Omnibus' because it contains many elements) was presented at the August 2020 Board Hearing of the California Air Resources Board (CARB or Board). Given that the trucking sector was the largest contributor to smog forming oxides of nitrogen (NOx) emissions in California, the proposal included a comprehensive set of requirements to reduce emissions from heavy-duty (HD) trucks. These requirements included many elements such as more stringent NOx and particulate matter (PM) emission standards, enhanced in-use testing procedures, a new certification test cycle representative of stop and go operations in heavy traffic conditions, longer useful life (UL) periods that better represent real life trucking operations, and longer warranty periods that would ensure more reliable trucks operating on California roadways. The Omnibus regulation established a significant set of requirements designed to ensure that NOx emissions from heavy-duty engines (HDE) are significantly reduced from the time the vehicle/engine is first sold until the end of its UL. The Omnibus regulation was designed to implement stringency in three separate steps. The first set of emission standards and requirements were designed to go into effect in model year (MY) 2024. The second set of requirements would become effective in 2027 MY, and the final step of the regulation would be implemented in 2031 MY. With each step of the…
Every notice about this measure published here, newest first. Each one is the notifying member's own text.
AddendumG/TBT/N/USA/2036/Rev.1/Add.6
Comment deadline: Closed on 15 July 2026
Second Notice of Public Availability of Modified Text and Availability of Additional Documents and Information for the Proposal to Permanently Adopt the Emergency Vehicle Emissions Regulations
At its 26 March 2026 public hearing, the California Air Resources Board (CARB) approved the permanent adoption of the Emergency Vehicle Emissions Regulations adopted via emergency rulemaking, which became effective on 2 October 2025. The Board approved for permanent adoption the proposed sections 1900, 1956.8, 1961.2, 1961.3, 1962.2, 1962.3, 1965, 1968.2, 1968.5, 1969, 1971.1, 1971.5, 1976, 1978, 2035, 2036, 2037, 2038, 2040, 2111, 2112, 2113, 2114, 2115, 2116, 2117, 2118, 2119, 2121, 2123, 2125, 2126, 2127, 2128, 2129, 2130, 2131, 2133, 2137, 2139, 2139.5, 2140, 2141, 2142, 2143, 2144, 2145, 2146, 2147, 2148, 2149, 2166, 2166.1, 2167, 2168, 2169, 2169.1, 2169.2, 2169.3, 2169.4, 2169.5, 2169.6, 2169.7, 2169.8, 2170, 2317, 2423, 2485, 2903, 1900.0.1, 1956.8.1, 1961.2.1, 1961.3.1, 1962.2.1, 1962.3.1, 1965.0.1, 1968.2.1, 1968.5.1, 1969.0.1, 1971.1.1, 1971.5.1, 1976.0.1, 1978.0.1, 2035.0.1, 2036.0.1, 2037.0.1, 2038.0.1, 2040.0.1, 2111.0.1, 2112.0.1, 2113.0.1, 2114.0.1, 2115.0.1, 2116.0.1, 2117.0.1, 2118.0.1, 2119.0.1, 2121.0.1, 2123.0.1, 2125.0.1, 2126.0.1, 2127.0.1, 2128.0.1, 2129.0.1, 2130.0.1, 2131.0.1, 2133.0.1, 2137.0.1, 2139.0.1, 2140.0.1, 2141.0.1, 2142.0.1, 2143.0.1, 2144.0.1, 2145.0.1, 2146.0.1, 2147.0.1, 2148.0.1, 2149.0.1, 2317.0.1, 2423.0.1, 2485.0.1, and 2903.0.1, Title 13, California Code of Regulations (CCR); sections 95300, 95301, 95302, 95303, 95304, 95305, 95306, 95307, 95308, 95309, 95310, 95311, 95312, 95660, 95661, 95662, 95663, 95664, 95300.0.1, 95301.0.1…
AddendumG/TBT/N/USA/2036/Rev.1/Add.5
Comment deadline: Closed on 20 April 2026
Public Availability of Modified Text and Availability of Additional Documents and Information for the Proposal to Permanently Adopt the Emergency Vehicle Emissions Regulations
The California Air Resources Board (CARB) has determined that additional modifications are appropriate for the proposed amendments and has developed proposed modifications (15-Day Changes). The Appendices showing the specific proposed modifications to the text of the proposed regulation being made with these 15-Day Changes are shown in multiple ways to meet the requirements of the Administrative Procedure Act (APA) while also posting alternate/complementary versions that provide increased accessibility to view the modifications. Documents posted 3 April 2026 - Notice of Public Availability of Modified Text and Availability of Additional Documents (Deadline to Comment: 20 April 2026) Appendix A-3.1 (15-Day Changes Available for Comment) Appendix A-3.2 ~Alternate Format to Appendix A-3.1~ Appendix A-3.3 ~For Review Only~ Appendix A-4-1.1 (15-Day Changes Available for Comment) Appendix A-4-1.2 ~Alternate Format to Appendix A-4-1.1~ Appendix A-4-1.3 ~For Review Only~ Appendix A-4-2.1 (15-Day Changes Available for Comment) Appendix A-4-2.2 ~Alternate Format to Appendix A-4-2.1~ Appendix A-4-2.3 ~For Review Only~ Appendix A-5.1 (15-Day Changes Available for Comment) Appendix A-5.2 ~Alternate Format to Appendix A-5.1~ Appendix A-5.3 ~For Review Only~ Appendix A-6.1 (15-Day Changes Available for Comment) Appendix A-6.2 ~Alternate Format to Appendix A-6.1~ Appendix A-6.3 ~For Review Only~ Resolution 26-3 Additional Documents Added to the Record In the interest of completeness and in…
AddendumG/TBT/N/USA/2036/Rev.1/Add.4
Notice of Rescheduled Public Hearing to Consider Proposal to Permanently Adopt the Emergency Vehicle Emissions Regulations
By notice dated and posted on the California Air Resources Board (CARB or Board) rulemaking website on 23 September 2025, and published in the 26 September 2025, California Regulatory Notice Register, Register 2025, Number 39-Z (pages 1192-1213), CARB announced its proposal to consider approving the permanent adoption of the Emergency Vehicle Emissions Regulations adopted via emergency rulemaking (notified as G/TBT/N/USA/2036/Rev.1), and became effective 2 October 2025. On 7 November 2025, CARB released a notice of postponement of the public hearing on the proposal that was initially scheduled for 20 November 2025 (notified as G/TBT/N/USA/2036/Rev.1/Add.1). Please be advised that CARB will conduct a public hearing at the date and time noted below to consider approving the permanent adoption of the Emergency Vehicle Emissions Regulations. Date: 26 March 2026 Time: 9:00 a.m. Pacific Time Location: California Environmental Protection Agency, California Air Resources Board | Byron Sher Auditorium 1001 I Street, Sacramento, California 95814 Remote Option: Zoom This public meeting may continue at 9:00 a.m. Pacific Time on 27 March 2026. Please consult the public agenda, which will be posted ten days before the 26 March 2026, Board Meeting, for important details, including the day on which this item will be considered and how the public can participate via Zoom if they choose to be remote. Further information from CARB: Proposed Emergency Amendment and Adoption of Vehicle…
AddendumG/TBT/N/USA/2036/Rev.1/Add.3
Proposed Amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus, Low Carbon Fuel Standard Regulations, and to Permanently Adopt the Emergency Vehicle Emissions Regulations
The California Air Resources Board (CARB or Board) proposes to readopt emergency vehicle emissions regulations (the 'Emergency Vehicle Emissions Regulations') for an additional 90 days under California Government Code, section 11346.1, subdivision (h). CARB adopted the Emergency Vehicle Emissions Regulations on 15 September 2025, amending California Code of Regulations (CCR), titles 13 and 17, and adopting new sections into California Code of Regulations, titles 13 and 17. The Emergency Vehicle Emissions Regulations confirm that, until a court resolves the uncertainty created by the federal government’s actions, certain antecedent regulations (displaced by Advanced Clean Cars (ACC) II and Omnibus) remain operative (as previously adopted) with the caveat that CARB may enforce ACC II and Omnibus, to the extent permitted by law, in the event a court of law holds invalid the resolutions purporting to disapprove those waivers. The Emergency Vehicle Emissions Regulations became effective on 2 October 2025. Unless permanently adopted within a period of 180 days from the effective date or readopted for an additional 90 days, the Emergency Vehicle Emissions Regulations will expire on 1 April 2026. (Government Code section 11346.1, subds. (e) & (h).) This readoption would extend the effectiveness of the Emergency Vehicle Emissions Regulations from 1 April 2026 to 30 June 2026. Further information from CARB: Proposed Emergency Amendment and Adoption of Vehicle Emissions Regulations…
AddendumG/TBT/N/USA/2036/Rev.1/Add.2
Proposed Emergency Amendment and Adoption of Vehicle Emissions Regulations
Six documents were posted on 3 October 2025 by the California Air Resources Board (CARB) on its website at providing the final version of the emergency regulations to include minor corrections to the amended and proposed regulation text, ensuring consistency with the previously adopted versions approved by the Office of Administrative Law. These corrections were made before the regulations were filed with the Secretary of State under the emergency regulation provisions of Government Code sections 11346.1 and 11349.6, along with California Code of Regulations, title 1, sections 48 through 56, and in accordance with the Emergency Notice that stated the purpose of the emergency regulations is to clarify that previously-adopted regulations remain operative and that CARB would accordingly consider other changes to the sections affected. These corrections do not affect the regulatory intent or application. These corrections are reflected in the regulation filed with the Secretary of State on 2 October 2025. The Board will consider in a subsequent rulemaking whether to make these regulations permanent. See On-Road Heavy-Duty Engine and Vehicle Omnibus, Low Carbon Fuel Standard, and Emergency Vehicle Emissions Regulations | California Air Resources Board The six documents are as follows, with exact links to them appearing in the 'Text of the final measure' section of this addendum: Appendix A-1 Appendix A-2-1 (part 1) Appendix A-2-1 (part 2) Appendix A-2-2 Appendix A-3 Appendix A-4
AddendumG/TBT/N/USA/2036/Rev.1/Add.1
Notice of Postponement; Public Hearing to Consider Proposed Amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus and the Low Carbon Fuel Standard Regulations, and to Permanently Adopt the Emergency Vehicle Emissions Regulations
The California Air Resources Board (CARB) announced it would conduct a public hearing to consider Proposed Amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus Regulation and to the Low Carbon Fuel Standard Regulations, and to Permanently Adopt the Emergency Vehicle Emissions Regulations (notified as G/TBT/N/USA/2036/Rev.1). The hearing was scheduled for 20 November 2025, at 9:00 a.m., at the California Environmental Protection Agency, California Air Resources Board, 1001 'I' Street, Byron Sher Auditorium, Second Floor, Sacramento, California. Please Be Advised that CARB will not hear these items at the 20 November 2025, hearing. The hearing on these items has thus been postponed to a future date and time. A subsequent notice will follow in the future with more information, including the date, time, and location of the rescheduled hearing. The public comment period for the regulatory action, which began on 26 September 2025, and which closed on 10 November 2025, has not been extended. The original 45-Day Notice, the Initial Statement of Reasons, and all subsequent regulatory documents for these three proposals are available on CARB’s website at
RevisionG/TBT/N/USA/2036/Rev.1
Comment deadline: Closed on 10 November 2025
Proposed Amendments to the On-Road Heavy-Duty Engine and Vehicle Omnibus, Low Carbon Fuel Standard Regulations, and to Permanently Adopt the Emergency Vehicle Emissions Regulations
The proposal for the On-Road Heavy-Duty Engine and Vehicle Omnibus regulation (called 'Omnibus' because it contains many elements) was presented at the August 2020 Board Hearing of the California Air Resources Board (CARB or Board). Given that the trucking sector was the largest contributor to smog forming oxides of nitrogen (NOx) emissions in California, the proposal included a comprehensive set of requirements to reduce emissions from heavy-duty (HD) trucks. These requirements included many elements such as more stringent NOx and particulate matter (PM) emission standards, enhanced in-use testing procedures, a new certification test cycle representative of stop and go operations in heavy traffic conditions, longer useful life (UL) periods that better represent real life trucking operations, and longer warranty periods that would ensure more reliable trucks operating on California roadways. The Omnibus regulation established a significant set of requirements designed to ensure that NOx emissions from heavy-duty engines (HDE) are significantly reduced from the time the vehicle/engine is first sold until the end of its UL. The Omnibus regulation was designed to implement stringency in three separate steps. The first set of emission standards and requirements were designed to go into effect in model year (MY) 2024. The second set of requirements would become effective in 2027 MY, and the final step of the regulation would be implemented in 2031 MY. With each step of the…
AddendumG/TBT/N/USA/2036/Add.4
Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation
The California Air Resources Board (CARB) staff invites you to participate remotely in a public workshop to discuss proposed amendments to the Heavy-Duty Engine and Vehicle Omnibus (Omnibus) Regulation. The proposed amendment would primarily align the Omnibus regulation’s requirements for new 2027 and subsequent model year (MY) heavy-duty (HD) engines with the corresponding provisions of the U.S. Environmental Protection Agency (U.S. EPA) Clean Trucks Plan oxides of nitrogen (EPA-NOx) rule. The workshop will be held via Zoom webinar at the following date and time: Date: 20 March 2024 Time: 9:00 a.m. – 12:00 p.m. (Pacific Time) Location: Zoom Webinar/Teleconference Link to Register: Staff’s presentation, and any additional webinar related documents, will be made available prior to the workshop meeting on CARB’s website:
AddendumG/TBT/N/USA/2036/Add.3
Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation
The California Air Resources Board (CARB) has posted new guidance documents for manufacturers, dealers, upfitters, and buyers to clarify when a heavy-duty engine must be California-certified and subject to the California Averaging, Banking and Trading program requirements (fully offset) under Title 13, California Code of Regulations, Sections 1956.8(b) and 2015(r). These guidance documents provide additional information to assist stakeholders in planning efforts to comply with the Heavy-Duty Engine and Vehicle Omnibus (Omnibus) regulation: Clarifications for California Truck Dealers Regarding Sales Outside California; CARB Responses Regarding Requests for Enforcement Discretion for Advanced Clean Fleets and Omnibus Regulations While these documents are intended to help with compliance efforts, it is the sole responsibility of each regulated entity to ensure compliance with the Omnibus regulation. In July 2023, CARB announced a Clean Truck Partnership with the nation’s leading truck manufacturers and the Truck and Engine Manufacturers Association. CARB has created a website to track the status and outcome of commitments made as part of that partnership: Clean Truck Partnership Commitments. In August 2023, CARB staff proposed amendments to the Omnibus regulation to provide additional compliance flexibilities in the 2024 through 2026 model year timeframe, while maintaining the emissions benefits of the Omnibus regulation. CARB’s Executive Officer signed Executive Order…
AddendumG/TBT/N/USA/2036/Add.2
Comment deadline: Closed on 21 December 2023
Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation
By notice posted on the California Air Resources Board’s (CARB or Board) webpage on 1 August 2023, and published in the 4 August 2023, California Regulatory Notice Register (Register 2023, Number 31-Z), CARB announced a public comment period for the Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation. CARB subsequently received several requests for a public hearing, and CARB’s Executive Officer (EO) conducted a hearing on 20 October 2023, to consider approving the proposed amendments, under the authority delegated to the EO pursuant to Resolution 23-15. CARB staff has determined that additional modifications to the initially proposed amendments are appropriate and has developed the proposed modifications (15-Day Changes) as stated below in the 'Summary of Proposed Modifications' section of this notice. The Appendices showing the specific proposed modifications to the text of the proposed regulation being made with these 15-Day Changes are shown in multiple ways in order to meet the requirements of the Administrative Procedure Act (APA) while also posting alternate/complementary versions that provide increased accessibility to view the modifications in multiple ways. The proposed modified regulatory language is available for public comment for a period of at least 15 days as required by Government Code section 11346.8. To be considered by the EO, written comments must be submitted by 21 December 2023. Hearing Action and Supplemental 15 Day Notices…
AddendumG/TBT/N/USA/2036/Add.1
Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation
By notice posted on the California Air Resources Board's (CARB or Board) webpage on 1 August 2023, and published in the 4 August 2023, California Regulatory Notice Register (Register 2023, Number 31-Z), CARB announced a public comment period for Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation. No hearing was scheduled at the time of publication; however, a request for a hearing could be made by 3 September 2023. Subsequently, CARB received several requests for a public hearing, and is therefore providing notice that it has scheduled a public hearing as detailed below. CARB will conduct an Executive Officer hearing at the date, time, and location noted below: Date: 20 October 2023 Time: 10:00 a.m. Pacific Standard Time (PST) Location: California Environmental Protection Agency California Air Resources Board | Coastal Hearing Room 1001 I Street Sacramento, California 95814 Remote Option: Zoom Please consult the public agenda, which will be posted ten days before the 20 October 2023, Executive Officer Hearing, for important details, including how the public can participate via Zoom if they choose to be remote. Hearing information may also be posted online at The original 45-Day Notice, ISOR, and all subsequent regulatory documents are available through CARB's Rulemaking webpage.
Regular notificationG/TBT/N/USA/2036
Comment deadline: Closed on 18 September 2023
Proposed Amendments to the Heavy-Duty Engine and Vehicle Omnibus Regulation
Proposed rule - The Executive Officer (EO) of the California Air Resources Board (CARB or Board) is proposing to consider the adoption of amendments to the Heavy-Duty (HD) Engine and Vehicle Omnibus (Omnibus) regulation under the authority granted by the Board in Resolution 23-15, wherein the Board delegated to the EO the power to adopt, amend, and revoke emission standards, test procedures, compliance test procedures, and compliance flexibilities for new on-road motor vehicles that the Board previously reserved to itself in Board Resolution 78-10.
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