MSHA Deletes Outdated Diesel-Dust Limits From Underground Mine Rulebook
Published Date: 11/12/2026
Rule
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Starting December 14, 2026, underground metal and nonmetal mine workers will see outdated diesel dust rules removed to keep things clear and current.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.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
Outdated diesel rules removed, no cost
Starting December 14, 2026, MSHA removes and reserves paragraphs (a), (b)(1), and (b)(2) of 30 CFR 57.5060 to eliminate outdated diesel particulate matter (DPM) requirements.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 or burdens on underground metal and nonmetal mine operators or workers.
Confirms DPM exposure limit: 160 µg/m3
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 the revised 30 CFR 57.5060 and becomes effective December 14, 2026.
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