G/TBT/N/USA/1620/Rev.1  
30 June 2021  
(21-5225) Page: 1/2 
Committee on Technical Barriers to Trade  Original:  English  
 
  
NOTIFICATION  
Revision  
The following notification is being circulated in accordance with Article 10.6.  
 
1. Notifying Member:  UNITED STATES OF AMERICA  
If applicable, name of local government involved (Articles 3.2 and 7.2):   
2. Agency responsible:  Environmental Protection Agency (EPA)  
Name and address (including telephone and fax numbers, email and website 
addresses, if available) of  agency or authority designated to handle comments 
regarding the notification shall be indicated if diffe rent from above:   
Please submit comments to: USA WTO TBT Enquiry Point, Email: usatbtep@nist.gov   
3. Notified under Article 2.9.2 [X], 2.10.1 [   ], 5.6.2 [X], 5.7.1 [   ], other :   
4. Products covered (HS or CCCN where applicable, otherwise national tariff 
heading.  ICS numbers may be provided in addition, where applicable):  Heavy -
duty engines and vehicles; Spark -ignition reciprocating or rotary internal combustion 
piston engine (HS 8407); Compression -ignition internal combustion piston engine "diesel 
or semi -diesel engines" (HS 8408); Motor vehicles for the transport of >= 10 persons, 
incl. driver (HS 8702); Motor cars and other motor vehicles principally designed for the 
transport of persons, incl. station wag ons and racing cars (excl. motor vehicles of heading 
8702) (HS 8703); Motor vehicles for the transport of goods, incl. chassis with engine and 
cab (HS 8704); Special purpose motor vehicles (other than those principally designed for 
the transport of persons  or goods), e.g. breakdown lorries, crane lorries, fire fighting 
vehicles, concrete -mixer lorries, road sweeper lorries, spraying lorries, mobile workshops 
and mobile radiological units (HS 8705); Quality (ICS 03.120), Air quality (ICS 13.040), 
Test condit ions and procedures in general (ICS 19.020), Road vehicles in general (ICS 
43.020), Commercial vehicles (ICS 43.080), Passenger cars. Caravans and light trailers 
(ICS 43.100)  
5. Title, number of pages and language(s) of the notified document:  Improvements  
for Heavy -Duty Engine and Vehicle Test Procedures, and Other Technical Amendments (6 
page(s), in English)  
6. Description of content:  Notice of proposed rulemaking - This notice of proposed 
rulemaking includes corrections, clarifications, additional flexi bilities, and adjustment 
factors to improve the Greenhouse gas Emissions Model (GEM) compliance tool for heavy -
duty vehicles while more closely matching the outputs produced by the original GEM 
version 3.0 that was used to establish the CO2 standards for M odel Years 2021 and later 
in the 2016 Heavy -duty Phase 2 final rule. This document supplements the proposed rule 
published on May 12, 2020, which included a larger set of proposed revisions to modify 
and improve GEM. Most of the proposed revisions from tha t notice of proposed rulemaking 
are addressed in a final rulemaking published elsewhere in the Final Rules section of this 
issue of the Federal Register. Given the nature of this proposal, there will be neither 
significant environmental impacts nor signifi cant economic impacts for any sector. If G/TBT/N/USA/1620/Rev.1  
 
- 2 - 
 
  requested on or before 6 July 2021, the EPA will host an online public hearing at 10 a.m. 
Eastern Standard Time on 14 July 2021.  
7. Objective and rationale, including the nature of urgent problems where 
applicable:  Protection of the environment; Quality requirements; Harmonization; Cost 
saving and productivity enhancement   
8. Relevant documents:  86 Federal Register (FR) 34189, 29 June 2021; Title 40 Code of 
Federal Regulations (CFR) Parts 1036 and 1037:  
https://www.govinfo.gov/content/pkg/FR -2021-06-29/html/2021 -05305.htm  
https://www.govinfo.gov/content/pkg/FR -2021-06-29/pdf/2021 -05305.pdf  
This notice of proposed rulemaking and and other actions notified u nder the 
symbol  G/TBT/N/USA/1620  are identified by Docket Number EPA -HQ-OAR-2019-0307. 
The Docket Folder is available on Regulations.gov at 
https://www.regulations.gov/docket/EPA -HQ-OAR-2019-0307/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. WTO Members 
and their stakeholders are asked to submit comments and/or requests for an online public 
hearing  to the USA TBT Enquiry Point . Comments received by the USA TBT Enquiry Po int 
from WTO Members and their stakeholders will be shared with the regulator and will also 
be submitted to the Docket  on Regulations.gov if received within the comment period . 
9. Proposed date of adoption:  To be determined  
Proposed date of entry into force:  To be determined  
10. Final date for comments:  30 August 2021  
11. Texts available from:  National enquiry point [ ] or address, telephone or fax 
numbers  and email and website address es, if available , of other body:   
https://members.wto.org/crnattachments/2021/TBT/USA/21_4407_00_e.pdf