G/TBT/N/USA/1567/Add.3  
 
25 January 2023  
(23-0602) Page: 1/2 
Committee on Technical Barriers to Trade  Original: English  
 
 
NOTIFICATION  
Addendum  
The following communication , dated  25 January 2023, is being circulated at the request of the 
delegation of the United States of America . 
 
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Title:  Control of Air Pollution From New Motor Vehicles: Heavy -Duty Engine Standards  
 
Reason for Addendum:  
[ ] Comment period changed - date:   
[ ] Notified measure adopted - date:  
[X] Notified measure published - date: 24 January 2023  
[X] Notified measure enters into force - date: 27 March 2023  
[X] Text of final measure available from1:  
https://www.govinfo.gov/content/pkg/FR -2023-01-24/html/2 022-27957.htm  
https://www.govinfo.gov/content/pkg/FR -2023-01-24/pdf/2022 -27957.pdf  
https://members.wto.org/crnattachments/2023/TBT/USA/final_measure/23_0661_00_
e.pdf 
[ ] Notified measure withdrawn or revoked - date:  
Relevant sym bol 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:  
[ ] Other:  
 
Description:  TITLE: Control of Air Pollution From New Motor Vehicles: Heavy -Duty Engine and 
Vehicle Standards  
AGENCY: Environmental Protection Agency (EPA)  
ACTION: Final rule  
SUMMARY: The Environmental Protection Agency (EPA) is finalizing a program to further reduce air 
pollution, including ozone and particulate matter (PM), from heavy -duty engines and vehicles  across 
the United States. The final program includes new emission standards that are significantly more 
stringent and that cover a wider range of heavy -duty engine operating conditions compared to 
today's standards; further, the final program requires the se more stringent emissions standards to 
be met for a longer period of when these engines operate on the road. Heavy -duty vehicles and 
 
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/1567/Add.3  
 
- 2 - 
 
  engines are important contributors to concentrations of ozone and particulate matter and their 
resulting threat to public  health, which includes premature death, respiratory illness (including 
childhood asthma), cardiovascular problems, and other adverse health impacts. The final rulemaking 
promulgates new numeric standards and changes key provisions of the existing heavy -duty emission 
control program, including the test procedures, regulatory useful life, emission -related warranty, 
and other requirements. Together, the provisions in the final rule will further reduce the air quality 
impacts of heavy -duty engines across a ran ge of operating conditions and over a longer period of 
the operational life of heavy - duty engines. The requirements in the final rule will lower emissions 
of NOX and other air pollutants (PM, hydrocarbons (HC), carbon monoxide (CO), and air toxics) 
beginn ing no later than model year 2027. We are also finalizing limited amendments to the 
regulations that implement our air pollutant emission standards for other sectors (e.g., light -duty 
vehicles, marine diesel engines, locomotives, and various other types of  nonroad engines, vehicles, 
and equipment).  
DATES: This final rule is effective on 27 March 2023. The incorporation by reference of certain 
material listed in this rule is approved by the Director of the Federal Register as of 27 March 2023.  
This final rul e and previous actions notified under the symbol G/TBT/N/USA/1567  are identified by 
Docket Number EPA -HQ-OAR-2019-0055. The Docket Folder is available from Regulations.go v at 
https://www.regulations.gov/docket/EPA -HQ-OAR-2019-0055/document  and provides access to 
primary and supporting documents as well as comments received. Documents are also accessible 
from Regulations.gov  by searching the Docket Number.  
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