An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Ground-level Ozone Pollution

2008 Ozone National Ambient Air Quality Standards (NAAQS) Infrastructure Actions

Findings of Failure to Submit a Section 110 State Implementation Plan (SIP) for Interstate Transport for the 2008 Ozone Standards
July 13, 2015 – EPA finds that 24 states have failed to submit complete “good neighbor” State Implementation Plans (SIPs).  These plans must demonstrate how the state will address air pollution that crosses its border and impacts other states’ ability to attain and maintain the national ambient air quality standard (NAAQS) for ozone established in 2008.

EPA Makes Findings of Failure to Submit Infrastructure State Implementation Plans - 2008 Ozone Standard
January 15, 2013 - EPA issued findings that 28 states, Washington DC and Puerto Rico missed Clean Air Act deadlines for submitting plans for implementing EPA's 2008 national air quality standards for the ozone.

The Docket No. EPA-HQ-OAR-2012-0943 contains both of these notices, supporting documents, and public comments.