The Role of Retrospective Analysis in an Era of Deregulation: Lessons from the US Mercury and Air Toxics Standards

Mary Evans, Karen Palmer, Joseph Aldy, Meredith Fowlie, Matthew Kotchen and Arik Levinson ()

Review of Environmental Economics and Policy, 2021, vol. 15, issue 1, 163 - 168

Abstract: As of late 2020, the Trump administration had initiated almost 100 rollbacks of US environmental regulations. A careful assessment of the benefits and costs of rolling back an existing regulation can and should inform such decisions. When assessing the potential rollback of an existing regulation, analysts can often learn from the regulation’s implementation through retrospective analysis as well as from advances in scientific knowledge. We discuss recent actions concerning the Mercury and Air Toxics Standards (MATS) to illustrate the potential lessons from doing so. In the case of MATS, advances in science have shed light on broader exposure pathways and previously unquantified health effects, suggesting that the benefits of reducing mercury emissions may exceed previous estimates. At the same time, changes in the energy sector have altered the mix of fuels used to produce electricity, which impacts both the benefits and the costs of the regulation.

Date: 2021
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