Federal Register #2026-23050

MSHA Rule Updates Diesel Particulate Matter Requirements for Underground Mines

The Mine Safety and Health Administration issued a final rule updating diesel particulate matter requirements for underground metal and nonmetal mines. - Government buyer: U.S. Department of Labor, Mine Safety and Health Administration (MSHA). - Action: Regulatory change, not a procurement; no products or services are requested. - Requirements: Removes and reserves provisions containing obsolete exposure limits and effective dates, and clarifies the existing eight-hour exposure limit of 160 micrograms of total carbon per cubic meter of air. - Notable impact: MSHA states the change does not reduce miner protections, impose new costs, or create new information-collection requirements. - OEMs and vendors: None named.

Description

MSHA's final rule removes outdated diesel particulate matter personal exposure limit requirements for underground metal and nonmetal mines. It removes and reserves 30 CFR 57.5060(a), (b)(1), and (b)(2), and revises paragraph (b)(3) to clarify the existing exposure limit of 160 micrograms of total carbon per cubic meter of air over an eight-hour equivalent full shift. MSHA states the changes do not reduce miner protections and impose no new costs. The rule is effective December 14, 2026.

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