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

Ozone National Ambient Air Quality Standards (NAAQS) Section 176 Petitions

Section 176 of the Clean Air Act gives states the authority to ask EPA to modify the Ozone Transport Region which was created to address regional ground-level ozone problems.

Maine - August 2018

Connecticut, Delaware, Maryland, Massachusetts, New Hampshire, New York, Pennsylvania, Rhode Island and Vermont - December 9, 2013