An official website of the United States government.

Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

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 Implementation Regulatory Actions

The Clean Air Act requires EPA to set National Ambient Air Quality Standards (NAAQS) for six criteria pollutants; ozone pollution is one of these.  EPA works with partners at state, local, and tribal air quality agencies to meet these standards.

The following list provides a collection of rules and guidance documents for implementation the more recent ozone standards:

To see a table of all of the Ozone NAAQS visit our Ozone National Ambient Air Quality Standards (NAAQS) page.