The Clean Air Act Amendments of 1990 return all responsibilities for SIPs to the states.

Name: The Clean Air Act Amendments of 1990 return all responsibilities for SIPs to the states.
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The Clean Air Act Amendments of 1990 did not return all responsibilities for State Implementation Plans (SIPs) to the states; rather, they expanded the federal government's role in enforcing national air quality standards, while still requiring states to develop and implement SIPs in compliance with those standards.

The Clean Air Act Amendments of 1990 Return All Responsibilities