MSHA is requesting public comment on two issues: (1) MSHA’s existing standards and regulations that could be improved or made more effective or less burdensome by accommodating advances in technology, innovative techniques, or less costly methods, including the requirements that could be streamlined or replaced in frequency; and (2) The Agency’s retrospective review of the final rule entitled Lowering Miners’ Exposure to the Respirable Coal Mine Dust, Including Continuous Personal Dust monitors (CPDM) (Dust). Stakeholder comments will assist MSHA in evaluating whether modifications of existing standards and regulations can better achieve regulatory objectives and, for the retrospective study, will assist MSHA in evaluating whether the final Dust rule is achieving respirable dust levels to protect miners’ health.