State Implementation Plan Status and Information

This web site identifies how states and EPA work together to ensure that the agency's National Ambient Air Quality Standards (NAAQS) are met and maintained. The Clean Air Act requires states to develop a general plan to attain and maintain the NAAQS in all areas of the country and a specific plan to attain the standards for each area designated nonattainment for a NAAQS. These plans, known as State Implementation Plans or SIPs, are developed by state and local air quality management agencies and submitted to EPA for approval. This web site contains information on this process:

State Implementation Plan Overview. An overview of State Implementation Plans.
State Implementation Plan Development Process. A summary of the steps states must follow when EPA revises or sets a new national ambient air quality standard.
Status of Nonattainment Area and Ozone Transport Region SIP Requirements. States that have areas not meeting any one of the NAAQS must submit state plans to EPA that detail how they will meet and continue to meet the standards. EPA must approve or disapprove these plans. This page shows the status of each state submittal and EPA action on required SIP elements for each nonattainment area, including Ozone Transport Region requirements for specific states.
Infrastructure SIP Element Reports. The status of the state submittal and EPA action on the submittal for required infrastructure elements.
Clean Data Policy & Redesignation Policy. Overview of EPA policies and implementation rules outlining EPA interpretations of the provisions of the Clean Air Act as they apply to areas that have attained standards.
EPA Regional Office Implementation Plan Links. Regional SIP Web Pages where state regulations which have been incorporated by reference into the SIP are located.

State Implementation Plan Status and Information

Local Navigation