An approved SIP is treated as both state and federal law, enforceable by either its state of implementation or the federal government.

Question

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State Implementation Plans (SIPs) are detailed outlines of how a state intends to implement, maintain, and enforce national ambient air quality standards (NAAQS) as required by the Clean Air Act. Once approved by the Environmental Protection Agency (EPA), SIPs have the force of federal law and can be enforced by both the state and the federal government.

An Approved SIP Is Treated as Both State and Federal