AGENCY:

Occupational Safety and Health Administration (OSHA), Labor.

ACTION:

Proposed rule; reopening of the rulemaking record.

SUMMARY:

OSHA is providing an additional comment period to allow interested persons to comment on OSHA's proposal to revise the 1,3-Butadiene standard. Following consideration of the rulemaking by OSHA's Advisory Committee on Construction Safety and Health ( printed page 46036) (ACCSH), OSHA is reopening the record for this rulemaking to provide an additional 30 days for public comment.

DATES:

Written comments must be submitted on or before August 21, 2026.

ADDRESSES:

Written comments: You may submit comments and attachments, identified by Docket No. OSHA-2025-0020, electronically at www.regulations.gov, which is the Federal e-Rulemaking Portal. Follow the instructions online for making electronic submissions.

Instructions: All submissions must include the agency's name and the docket number for this rulemaking (Docket No. OSHA-2025-0020). When uploading multiple attachments to www.regulations.gov, please number all your attachments because www.regulations.gov will not automatically number the attachments. This will be very useful in identifying all attachments. For example, Attachment 1—title of your document, Attachment 2—title of your document, Attachment 3—title of your document. For assistance with commenting and uploading documents, please see the Frequently Asked Questions on www.regulations.gov.

All comments, including any personal information you provide, are placed in the public docket without change and may be made available online at www.regulations.gov. Therefore, OSHA cautions commenters about submitting information they do not want to make available to the public or submitting materials that contain personal information (either about themselves or others), such as Social Security Numbers and birthdates.

Docket: The docket for this rulemaking (Docket No. OSHA-2025-0020) is available at www.regulations.gov, the Federal eRulemaking Portal. Additional materials and information related to OSHA's consultation with the Advisory Committee on Construction Safety and Health (ACCSH) will be available at https://www.osha.gov/advisorycommittee/accsh/minutes. All comments and submissions are listed on the www.regulations.gov index; however, some information ( e.g., copyrighted material) may not be publicly available to read or download through that website. All documents submitted to www.regulations.gov, including copyrighted material, are available for inspection through the OSHA Docket Office. Contact the OSHA Docket Office at (202) 693-2350 (TTY number: (877) 889-5627) for assistance in locating docket submissions.

Copies of thisFederal Register Notice: Electronic copies of this Federal Register document are available at https://www.regulations.gov. This Federal Register notice, as well as news releases and other relevant information, is available at OSHA's web page at https://www.osha.gov.

FOR FURTHER INFORMATION CONTACT:

For press inquiries: Contact Frank Meilinger, Director, OSHA Office of Communications, U.S. Department of Labor; telephone: (202) 693-1999; email: OSHAComms@dol.gov.

For general information and technical inquiries: Contact Andrew Levinson, Director, Directorate of Standards and Guidance, Occupational Safety and Health Administration, U.S. Department of Labor; telephone: (202) 693-1950; email: osha.dsg@dol.gov.

SUPPLEMENTARY INFORMATION:

On July 1, 2025, OSHA published a proposal to revise OSHA's 1,3-Butadiene standard (29 CFR 1910.1051) in order to reduce compliance burdens, allow for the use of more up-to-date technology, and improve the comprehensibility of the requirements for respiratory protection programs under the standard (90 FR 28302). Part of the intent of this proposal was also to better align this standard with OSHA's Respiratory Protection standard (29 CFR 1910.134). The comment period was scheduled to end on September 2, 2025, but was subsequently extended an additional 60 days to November 1, 2025, in response to requests from the public (90 FR 40546).

At the time of publication of the proposal, OSHA was in the process of appointing members to the Advisory Committee on Construction Safety and Health (ACCSH). OSHA stated in the proposal that it would present this proposed rule to ACCSH once that process was complete and would place the Committee's recommendations on the OSHA website and in the docket for this proposed rule to allow the public to provide comments on those recommendations. OSHA consulted with ACCSH on April 1 and May 19, 2026, and is now reopening the rulemaking record to allow for public comment for an additional 30 days. To read or download the ACCSH recommendations, comments, and other materials submitted in the docket, go to Docket No. OSHA-2025-0020 at www.regulations.gov. Additional materials and information related to OSHA's consultation with ACCSH will be available at https://www.osha.gov/advisorycommittee/accsh/minutes.

Authority and Signature

This document was prepared under the direction of David Keeling, Assistant Secretary of Labor for Occupational Safety and Health. It is issued under the authority of sections 4, 6, and 8 of the Occupational Safety and Health Act of 1970 (29 U.S.C. 653, 655, and 657), 33 U.S.C. 941, 40 U.S.C. 3704, 5 U.S.C. 553, 29 CFR part 1911, and Secretary of Labor's Order No. 07-2025 (90 FR 27878).

Dated: July 16, 2026.

David Keeling,

Assistant Secretary of Labor for Occupational Safety and Health.

1, 3-Butadiene

Department of Labor

Occupational Safety and Health Administration