Under the Federal Clean Air Act (CAA), State Implementation Plans (SIPs) must be developed by each state that has areas that are designated nonattainment. A SIP is a plan describing how it will attain and maintain national ambient air quality standards (NAAQS). Included in the SIP requirements are established systems to monitor, compile, and analyze data on air quality. The EPA must approve each SIP, and the public is given opportunity to participate in the SIP review and approval.
Each state has only one SIP, SIP revisions may be required by amendments to the CAA, by EPA, or by state initiated changes. Revisions may be prepared for a specific area or for a control strategy.
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