Improvements for Heavy-Duty Engine
and Vehicle Test Procedures:
Supplemental Proposal
t I Hiis supplemental proposal includes additional corrections,
JL clarifications, flexibilities, and adjustment factors to improve
the Greenhouse gas Emissions Model (GEM) compliance tool for
heavy-duty vehicles.
a;
This proposal supplements the original proposed rule published on May 12, 2020 (85
FR 28153) titled "Improvements for Heavy-Duty Engine and Vehicle Test Procedures,
and other Technical Amendments" which included a larger set of proposed revisions to
modify and improve the GEM compliance tool. In this action EPA proposes additional
C amendments concerning certain aspects of GEM. The changes proposed in this action
would result in an improved and more accurate model that more closely matches the
outputs produced by GEM 3.0, the model used to establish C07 emission standards
for Model Year 2021 and later in the 2016 Heavy-duty Phase II final rule. The proposed
amendments included in this notice would be required for model year 2022 and later
< vehicles and optional for model year 2021. Given the nature and limited scope of this
supplemental proposal, there will be neither significant environmental impacts nor
significant economic impacts for any sector.
J-
bG
-------
Who would be Affected by these Changes?
The changes would primarily affect manufacturers, importers, and secondary manufacturers
seeking certification for medium or heavy-duty vehicles and engines. The changes to the GEM
compliance tool procedure would also affect organizations that perform certification testing, such
as independent test laboratories.
Public Participation Opportunities
EPA welcomes comments on this supplemental proposed rule. Please see www2.epa.gov/dockets/
commenting-epa-dockets for more information on how to submit comments. The comment period
will be open for 60 days after this proposal is published in the Federal Register. All comments
should be identified by Docket ID No. EPA-HQ-OAR-2019-0307 and submitted
by one of the following methods:
Internet: www.regulations.gov
E-mail: A-and-R-Docket@epa.gov
U.S. Postal Service address:
U.S. Environmental Protection Agency
EPA Docket Center, [EPA-HQ-OAR-2019-0307]
Mail Code 28221T
1200 Pennsylvania Avenue
NW, Washington, DC 20460
Express mail, commercial delivery, hand delivery or courier address to:
EPA Docket Center
WJC West Building, Room 3334
1301 Constitution Avenue
NW, Washington, DC 20004
For More Information
You can access the rule and related documents on EPA's Office of Transportation and Air
Quality website at:
www.epa.gov/regulations-emissions-vehicles-and-engines/supplemental-rule-
improvements-heavy-duty-engine-and.
------- |