SIP

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The State Implementation Plan (SIP) is a collection of required air quality planning documents prepared by states, territories, or local air districts to implement, maintain, and enforce the National Ambient Air Quality Standards and fulfill numerous other requirements of the Clean Air Act. They are submitted to EPA for approval and are living documents as sources, health effects, and standards change. Nonattainment SIPs identify actions and programs to show how each designated nonattainment area will attain and maintain air quality standards.