An approved SIP is treated as both state and federal law.

Question

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An approved State Implementation Plan (SIP) for air pollution control is treated as both state and federal law. This is because the Clean Air Act requires states to develop and submit SIPs to EPA for approval, and once approved, the SIP becomes the state's enforceable plan for achieving and maintaining compliance with the National Ambient Air Quality Standards (NAAQS). However, the SIP must also meet federal requirements and must be implemented consistently with federal law. As a result, an approved SIP is considered both state and federal law.

An Approved SIP Is Treated as Both State and Federal