The Environmental Protection Agency (EPA) is proposing processes that it would be required to undertake in promulgating regulations under the Clean Air Act (CAA) to ensure that information regarding the benefits and costs of regulatory decisions is provided and considered in a consistent and transparent manner. This proposed rulemaking addresses, among other things, issues raised in the June 13, 2018 advance notice of proposed rulemaking, “Increasing Consistency and Transparency in Considering Costs and Benefits in the Rulemaking Process,” and proposes how the concepts described in that advance document would be implemented in rulemakings conducted by the EPA using its authorities under the CAA. The EPA is proposing to establish procedural requirements governing the development and presentation of benefit-cost analyses (BCA), including risk assessments used in the BCA, for significant rulemakings conducted under the CAA. Together, these requirements would help ensure that the EPA implements its statutory obligations under the CAA, and describes its work in implementing those obligations, in a way that is consistent and transparent.