Air Pollution: Estimated Benefits and Costs of the Navajo Generating Station's Emissions Limit

Pursuant to a congressional request, GAO reviewed the Environmental Protection Agency's (EPA) decision to limit sulfur dioxide emissions from the Navajo Generating Station, focusing on: (1) the effect on emissions reductions and the associated costs that resulted from the negotiated agreement used by EPA in making its decision compared to its initial proposal; (2) the visibility improvements the agency estimated would result from the emissions controls and the means by which these improvements were determined; and (3) how contingent valuation was used to estimate the monetary value of visibility improvements.