G/TBT/N/USA/1632/Add.1  
 
14 February 2023  
(23-1063) Page: 1/2 
Committee on Technical Barriers to Trade  Original: English  
 
NOTIFICATION  
Addendum  
The following communication , dated  14 February 2023, is being circulated at the request of the 
delegation of the United States of America . 
 
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Title:  Heavy Duty Omnibus Low NOx Regulation  
 
Reason for Addendum:  
[ ] Comment period changed - date:   
[ ] Notified measure adopted - date:  
[ ] Notified measure published - date:  
[ ] Notified measure enters into force - date:  
[ ] Text of final measure available from1:  
[ ] Notified measure withdrawn or revoked - date:  
Relevant symbol if measure re -notified:   
[ ] Content or scope of notified measure changed  and text available from1:  
New deadline for comments (if applicable):   
[ ] Interpretive guidance issued and text available from1:  
[X] Other:  
Announcement of Public Workshop 3 March 2023  
https://ww2.arb.ca.gov/our -work/programs/heavy -duty-low-nox/heavy -duty-low-nox-
meetings -workshops  
https://content.govdelivery.com/accounts/CARB/bulletins/345e6c5  
https://members.wto.org/crnattachments/2023/TBT/USA/23_1073_00_e.pdf  
 
Description:  TITLE: Heavy Duty Omnibus Low NOx Regulation  
AGENCY: California Environmental Protection Agency, Air Resources Board (CalEPA CARB)  
ACTION: Public Workshop 3 March 2023  
SUMMARY: The CARB staff invites you to participate remotely in a public workshop to discuss the 
recently released U.S. Environmental Protection Agency (U.S. EPA) Clean Trucks Plan nitrogen oxides 
(CTP-NOx) Final Rule  "Control of Air Pollution from New Motor Vehicles: Heavy -Duty Engine and 
Vehicle Standards", EPA-HQ-OAR-2019-0055; FRL -7165-02-OAR (notif ied as 
 
1 This information can be provided by including a website address, a pdf attachment, or other 
information on where the text of the final /modified  measure and/or interpretive guidance can be obtained.  G/TBT/N/USA/1632/Add.1  
 
- 2 - 
 
  G/TBT/N/USA/1567/Add.3 ). The rule is part of a larger strategy that proposes a series of clean air 
regulations to reduce emissions from the heavy -duty (HD ) sector as part of the transition to 
electrification and decarbonization of this sector. CARB staff has reviewed the regulatory language 
to understand the differences between the federal program and California's HD Omnibus regulation 
and has identified tw o emissions differences between the Federal CTP -NOx program and California's 
Omnibus requirements. At the workshop, CARB staff will share technical evaluations of those 
elements as well as implications for emissions losses should CARB align with the federa l regulation.  
The public workshop to compare CARB's Heavy -Duty Low NOx Omnibus Rule with the Federal CTP -
NOx Final Rule  will be held 3 March 2023, at 12:00 PM Pacific Time . Registration is required.  
Webinar Registration:  
https://us06web.zoom.us/we binar/register/WN_lMxZjbbNRzC5ijy25__HTA?utm_medium=email&u
tm_source=govdelivery  
Workshop Notice:  
https://content.govdelivery.com/accounts/CARB/bulletins/345e6c5  
California Air Resources Board (CARB) Heavy Duty Low NOx:  
https://ww2.arb.ca.gov/our -work/programs/heavy -duty-low-nox 
The California Office of Administrative Law (OAL) approved the Heavy Duty Omnibus Low NOx 
Regulation and filed with the Se cretary of State on 22 December 2021. The effective date was also 
22 December 2021. Details are accessible online from CARB; Heavy -Duty Engine and Vehicle 
Omnibus Regulation and Associated Amendments 
https://ww2.arb.ca.gov/rulemaking/2020/hdomnibuslownox . 
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