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State Implementation Plan Development Process

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New or revised National Air Quality Standards: When EPA revises one of the national ambient air quality standards (NAAQS) or establishes a new NAAQS, States and EPA must undertake specific obligations to ensure the NAAQS are met.

SIPs must be developed with public input, be formally adopted by the state, and submitted by the Governor's designee to EPA. After reviewing submitted SIPs, EPA proposes to approve or disapprove all or part of each plan. The public has an opportunity to comment on EPA's proposed action. EPA considers public input before taking final action on a state's plan. If EPA approves all or part of a SIP, those control measures are enforceable in federal court. If a state fails to submit an approvable plan or if EPA disapproves a plan, EPA is required to develop a federal implementation plan (FIP).

EPA makes electronic copies of state SIP submissions available to the public no later than the time EPA's proposed rulemaking (NPR) on the SIP is published in the Federal Register. In each NPR, EPA provides information on how to locate the electronic docket at www.Regulations.gov for reviewing and submitting comments. Many state air quality management agencies also make SIPs available for public review on state-managed web sites.

SIP Efficiency and Effectiveness

EPA's goal is to minimize federal and state burden in developing SIPs, but ensure the plans effectiveness in complying with the Clean Air Act. Through collaboration with the The National Association of Clean Air Agencies (NACAA/ECOs) SIP Reform Work Group, EPA has issued the following guidance memos:


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