# 2026-23050: MSHA Deletes Outdated Diesel-Dust Limits From Underground Mine Rulebook

2026-23050, Improving and Eliminating Regulations; Limit on Exposure to Diesel Particulate Matter in Underground Metal and Nonmetal Mines, is a Federal Register rule from Labor Department, Mine Safety and Health Administration published 2026-11-12, effective 2026-12-14; PRIA reads it as touching household money (as of 2026-11-12).

- Canonical: https://policyrisk.com/federal-register/2026-23050
- As of: 2026-11-12
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-23050
- Title: Improving and Eliminating Regulations; Limit on Exposure to Diesel Particulate Matter in Underground Metal and Nonmetal Mines
- Type: Rule
- Agencies: Labor Department; Mine Safety and Health Administration
- Citation: 91 FR 72781
- Published: 2026-11-12
- Effective: 2026-12-14
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: 1219-AC10
- Last updated: 2026-11-12

## In one line

MSHA Deletes Outdated Diesel-Dust Limits From Underground Mine Rulebook

## Summary

Starting December 14, 2026, underground metal and nonmetal mine workers will see outdated diesel dust rules removed to keep things clear and current. MSHA is scrapping old diesel particulate matter exposure limits that no longer apply, making regulations simpler without cutting safety. This cleanup saves time and avoids confusion, with no extra costs for mines or workers.

## Abstract

MSHA is eliminating outdated requirements for diesel particulate matter (DPM) personal exposure limits for underground metal and nonmetal (MNM) mines. These requirements are being removed from MSHA's regulations because they contain outdated effective dates and exposure limits that are no longer applicable.

## Effects PRIA read

- Outdated diesel rules removed, no cost: benefit, low. Starting December 14, 2026, MSHA removes and reserves paragraphs (a), (b)(1), and (b)(2) of 30 CFR 57.5060 to eliminate outdated diesel particulate matter (DPM) requirements. MSHA states this cleanup streamlines the rules, maintains the same level of miner protection, and will not impose new costs…
- Confirms DPM exposure limit: 160 µg/m3: benefit, low. The rule confirms that a miner's personal exposure to diesel particulate matter (DPM) in an underground mine must not exceed an average eight-hour equivalent full shift airborne concentration of 160 micrograms of total carbon per cubic meter of air (160 TC µg/m3). This clarified limit is part of th…

## Related documents

- [2026-15717](https://policyrisk.com/federal-register/2026-15717): Ventilation Plan Approval Criteria, 2026-08-03
- [2026-15670](https://policyrisk.com/federal-register/2026-15670): Roof Control Plan Approval Criteria, 2026-08-03
- [2026-10456](https://policyrisk.com/federal-register/2026-10456): Department of Labor Federal Civil Penalties Inflation Adjustment Act Annual Adjustments for 2026, 2026-05-27
- [2025-12232](https://policyrisk.com/federal-register/2025-12232): Ventilation Plan Approval Criteria, 2025-07-01
- [2026-23051](https://policyrisk.com/federal-register/2026-23051): Improving and Eliminating Regulations; Installation of Foam Generator Systems in Underground Coal Mines, 2026-11-12
- [2026-23053](https://policyrisk.com/federal-register/2026-23053): Mining of Pillars, 2026-11-12

## Sources
- [2026-23050 on federalregister.gov](https://www.federalregister.gov/documents/2026/11/12/2026-23050/improving-and-eliminating-regulations-limit-on-exposure-to-diesel-particulate-matter-in-underground)
- [2026-23050 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-11-12/pdf/2026-23050.pdf)

## Related
- [Previous: 2026-23049, Improving and Eliminating Regulations; Permissible Lamps in Underground Coal Mi…](https://policyrisk.com/federal-register/2026-23049)
- [Next: 2026-23051, Improving and Eliminating Regulations; Installation of Foam Generator Systems i…](https://policyrisk.com/federal-register/2026-23051)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-23050 (as of 2026-11-12).