Document
EPA 2026 position on monetization of PM2.5 and ozone co-benefits in rulemaking
U.S. Environmental Protection Agency
Overview
EPA has restated its approach to monetizing PM2.5 and ozone co-benefits in regulatory impact analyses, prompting the question whether prior diesel rules would survive re-analysis under the current methodology.
Repeal relevance: If the co-benefit methodology has narrowed, prior diesel rules whose benefits were dominated by PM2.5 co-benefits should be re-run under the current framework before further tightening is defended.
Counterargument: A change in methodology is analysis only. It does not invalidate prior rules unless EPA or a court reopens them.
Awaiting verification · investigated 2026-07-10
What is missing
The specific EPA Office of Environmental Economics guidance, Federal Register notice, or Circular A-4 update that restates how PM2.5 and ozone co-benefits are to be monetized in 2026 regulatory-impact analyses. The current landing page is the general Environmental Economics program page.
What would resolve it
A direct link to the guidance document (or an OMB/EPA joint memo) that explicitly modifies co-benefit accounting for mobile-source rulemakings.
This record must not be promoted to verified-primary until a specific primary document is located that matches the claim above.