Final rule · 2026-12792

Improving and Eliminating Regulations; Diesel Particulate Matter Emission Limits in Underground Coal Mines

MSHA is eliminating outdated requirements for diesel particulate matter (DPM) emission limits for permissible diesel-powered equipment and non-permissible heavy-duty diesel-powered equipment operated in underground coal mines. These requirements are being removed from MSHA's regulations because they contain outdated effective dates that are no longer applicable.