Public Workshop to Compar e CARB’ s Heavy-Duty Low NOx Omnibus
Rule with the Clean Trucks Plan Nitr ogen Oxides Final Rule
California Air Resources Board sent this bulletin at 02/10/2023 04:30 PM PST
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February 10, 2023
Public W orkshop T o Compare CARB’ s Heavy-Duty
Low NOx Omnibus Rule with the Clean T rucks Plan
Nitrogen Oxides Final Rule “Control of Air Pollution
from New Motor V ehicles:
Heavy-Duty Engine and V ehicle Standards”,
EPA-HQ-OAR-2019-0055; FRL-7165-02-OAR
Held on March 3, 2023
The California Air Resources Board (CARB) staf f invites you to participate remotely
in a public workshop  to discuss the recently released U.S. Environmental
Protection Agency (U.S. EP A) Clean Trucks Plan nitrogen oxides (CTP-NOx) rule.
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 .
Since the release of the CTP-NOx final rule on December 20, 2022, CARB staf f
has reviewed the regulatory language to understand the dif ferences between the
federal program and California’ s HD Omnibus regulation. CARB staf f has identified
two elements of the CTP-NOx program, which are dif ferent from the Omnibus
requirements, that introduce emissions dif ferences between the two regulations. At
the workshop, CARB staf f will share technical evaluations of those elements as
well as implications for emissions losses should CARB align with the federal
regulation.
The first element is the temperature adjustment to the of f-cycle NOx standards
(temperature adjustment) as described in Title 40, Code of Federal Regulation,
§1036.104 (a)(3), i.e., 40 CFR §1036.104 (a)(3). This element, which applies attemperatures between 5 and 25 degrees Celsius, conditions commonly
encountered by trucks in California and the nation, was not included in the CTP-
NOx notice of proposed rulemaking (NPRM). CARB staf f will present tailpipe
emissions data from current model trucks on-the-road along with ambient and
exhaust temperature data.
The second element of the CTP-NOx rule is the interim NOx compliance allowance
for in-use testing as described in 40 CFR §1036.150 (y). Although this was
introduced as an interim measure in the proposed rule, the sunset date for this
provision has been removed in the final rule.
Staff will also discuss a potential way to make up for the benefit loss due to these
two elements by encouraging additional HD zero-emission vehicle (ZEV)
production within the upcoming federal Phase 3 greenhouse gas (GHG)
rulemaking. U.S. EP A is expected to propose Phase 3 GHG standards in March
2023.
Workshop
The workshop will be held via Zoom webinar at the following date and time:
Date:                 March 3, 2023
Time:                 12:00 noon – 2:00 p.m.
Location:           Zoom W ebinar/T eleconference
Register
After registering, you will receive a confirmation email containing information about
joining the workshop. Please use the link and password to join the workshop the
morning of the meeting. If you are using a tablet or smart phone, please download
the Zoom app. Ensure the latest version of Zoom  is installed on your device.
During the workshop, if you wish to provide comments or ask questions, please
use Zoom’ s “raise hand” feature. The “raise hand” button can be found on the
Zoom webinar window . For those who are joining via a conference call, press #2 to
raise your hand. The “Q&A” feature on Zoom will also be available to provide
comments and ask questions. This workshop will be recorded for future viewing.
Staff’s presentation, and any additional webinar related documents, will be made
available prior to the workshop meeting on CARB’ s website .Background
On August 27, 2020, CARB approved the Omnibus regulation which became
effective on December 22, 2021, when the Of fice of Administrative Law approved
the regulation. The objective of the Omnibus regulation was to reduce the NOx
emissions standards, increase the useful life and warranty periods, enhance the
durability demonstration requirements, and introduce new in-use testing protocols
for HD trucks.
U.S. EP A released its NPRM for the CTP-NOx rule on March 7, 2022. The final
version of the CTP-NOx rule was released on December 20, 2022 and published in
the January 24, 2023, edition of the Federal Register . The CTP-NOx rule includes
elements that are similar to the Omnibus regulation, but the levels of stringency
between many elements of the two regulations are dif ferent.
CARB staf f appreciates the fact that many HD engine and equipment
manufacturers would prefer to see a single set of nationwide (U.S. EP A and CARB)
requirements for the HD sector . Nevertheless, there are at least two elements of
the CTP-NOx rule that may require reconsideration before CARB staf f can consider
any future harmonization ef forts.
More Information
Contacts
If you have questions, please contact: HD Low NOx Program. 
If you require a special accommodation or need this document in another language
or in an alternate format (i.e., Braille, large print), please contact Isabel Guerra  as
soon as possible, but no later than 15 business days before the scheduled webinar .
TTY/TDD/Speech to Speech users may dial 71 1 for the California Relay Service.
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development activities, please subscribe . 
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