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Pursuant to a congressional request, GAO provided information on the 1990 Clean Air Act amendments, focusing on: (1) the status of the Environmental Protection Agency's (EPA) implementation of the requirements established by the 1990 amendments; and (2) views from state governments, local programs, industries that are regulated under the act, and environmental advocacy groups (collectively referred to as stakeholders) on the issues that have either helped or hindered the implementation of the 1990 amendments.

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