An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Ground-level Ozone Pollution

Implementation of the 2015 National Ambient Air Quality Standards for Ozone: Nonattainment Area State Implementation Plan Requirements

This final rule updates the implementing regulations previously promulgated for the 2008 ozone standards and retains without significant revision most of those provisions to implement the 2015 ozone standards.  In addition, it addresses a range of nonattainment area and Ozone Transport Region state implementation plan (SIP) requirements for the 2015 ozone standards.

Read a prepublication version of the notice and a summary fact sheet below.

See slides for EPA's November 20, 2018 webinar for the final rule below.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.