Document
The Benefits and Costs of the Clean Air Act from 1990 to 2020 (Second Prospective Study)
U.S. Environmental Protection Agency, Office of Air and Radiation
Overview
EPA's 2011 study projects $2 trillion in 2020 benefits against roughly $65 billion in costs, with the majority of monetized benefits attributable to PM2.5 mortality reductions.
Repeal relevance: This is the primary study historically used to justify diesel and mobile-source rules. It is essential for the counter-argument and for any honest re-run of cost-benefit analysis under revised methodology.