{"abstract":"This final rule revises MSHA's existing standards addressing diesel particulate matter (DPM) exposure in underground metal and nonmetal (M/NM) mines. In this final rule, MSHA changes the interim concentration limit measured by total carbon (TC) to a comparable permissible exposure limit (PEL) measured by elemental carbon (EC), which renders a more accurate DPM exposure measurement. Also, this final rule increases flexibility of compliance for mine operators by requiring MSHA's longstanding hierarchy of controls for its other exposure-based health standards at M/NM mines, but retains the prohibition on rotation of miners for compliance. 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