Public Hearing and Public Comments: Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines: Proposed Rule

How to Comment

Comments Due: August 29, 2026

Written comments on the proposal must be submitted to the docket for this rule by Saturday, August 29, 2026. There are several ways to provide written comments on the proposal, identified by Docket ID No. EPA-HQ-OAR-2026-0728:

  • Federal eRulemaking Portal for this proposal: click on the “Comment” box under the proposed rule document, which is the first document listed under the “browse comments” tab.
  • Email: a-and-r-Docket@epa.gov. Include Docket ID No. EPA-HQ-OAR-2026-0728 in the subject line of the message.
  • Mail: U.S. Environmental Protection Agency, EPA Docket Center, OAR, Docket EPA-HQ-OAR-2026-0728, Mail Code 28221T, 1200 Pennsylvania Avenue NW, Washington, DC 20460.
  • Hand Delivery or Courier (by scheduled appointment only): EPA Docket Center, WJC West Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. The Docket Center’s hours of operations are 8:30 a.m.–4:30 p.m., Monday–Friday (except federal holidays).

In written comments submitted to the docket, do not include any information you consider to be sensitive information, including but not limited to Confidential Business Information/Proprietary Business Information, medical information about someone other than yourself, or any information whose disclosure is restricted by an applicable authority. Please visit Commenting on EPA Dockets for more information on submitting comments, including information about how to submit sensitive information such as CBI/PBI or multimedia submissions, and general guidance on making effective comments.

EPA encourages commenters to submit information electronically to ensure timely receipt and public availability.

Summary

To view documents supporting this proposed rulemaking as well as comments submitted, please visit regulations.gov and access the rule under Docket ID Number EPA-HQ-OAR-2026-0728 or see the Proposed Rule page.

Public Comment Opportunity

EPA invites public comment on the proposed rule, Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines which was announced on July 9, 2026, and published on July 14, 2026, in the Federal Register under Docket ID number EPA-HQ-OAR-2026-0728. All comments received will be included in the public docket without change and will be made available for public inspection at Federal eRulemaking Portal, including any personally identifiable information provided.

Public Hearing

The public hearing will be conducted using Zoom Webinar. The hearing is scheduled to begin on Wednesday, July 29th and conclude on Thursday, July 30th. The general schedule of speaker blocks for the hearing are listed below (all times Eastern Daylight Time).

  • Block 1: 9:00 a.m. to 12:00 p.m. 
  • Block 2: 1:00 p.m. to 5:00 p.m. 
  • Block 3: 6:00 p.m. until at least 7:00 p.m. 
  • Block 4: 10:00 a.m. until at least 12:00 p.m.

The  list of speakers (pdf) (162.29 KB, July 2026)  for each block.

If you would like to speak at the hearing, please email EPAPublicHearing@icf.com or call 760-822-5470 with a request to be added to the waitlist. Please join the hearing via the instructions below. As speaker opportunities become available, public hearing staff will communicate with waitlisted registrants via Zoom.

For those not previously registered to speak, there may also be opportunities to speak announced throughout the day.

  • DAY 1: Wednesday, July 29, starting at 9 am EDT: 
    • Zoom link
    • Or Telephone (for higher quality, dial a number based on your current location):
      • +1 669 254 5252 US (San Jose)
      • +1 646 828 7666 US (New York)
    • Webinar ID: 165 317 9160
    • International numbers  
       
  • DAY 2: Thursday, July 30, starting at 10 am EDT:
    • Zoom link
    • Or Telephone (for higher quality, dial a number based on your current location):
      • +1 669 254 5252 US (San Jose)
      • +1 646 828 7666 US (New York)
    • Webinar ID: 165 628 0528
    • International numbers

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Last updated on July 28, 2026