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Ozone Pollution

Implementation of the 2015 National Ambient Air Quality Standards (NAAQS) for Ozone: State Implementation Plan (SIP) Requirements

Rule Summary

The U.S. Environmental Protection Agency (EPA) is proposing requirements for implementing the strengthened 2015 ozone NAAQS (the ‘‘2015 ozone NAAQS’’) that were promulgated on October 1, 2015.

This rule proposal contains three main components:

1)  nonattainment area classification thresholds and the timing of attainment dates for each nonattainment area classification for the 2015 ozone NAAQS;

2)  options to revoke the 2008 ozone NAAQS and, where applicable, provide anti-backsliding requirements to help smooth the transition between the two standards for nonattainment areas; and

3)  SIP requirements for states with nonattainment areas and states in an ozone transport region under the 2015 ozone NAAQS.

Rule History

03/01/2018 - Final Nonattainment Area Classifications Approach

11/17/2016 - Proposed Nonattainment Area Classifications and SIP Requirements Rule

12/13/2016 - Public Hearing Announcement and Comment Period Extension for Proposed Nonattainment Area Classifications and SIP Requirmements Rule

Additional Resources

Fact Sheet: Final Nonattainment Area Classifications Approach

Implementation of the Ozone National Ambient Air Quality Standard (NAAQS) Memorandum

Fact Sheet and Webinar Information:  Proposed Requirements for Implementing the 2015 Ozone Standards

Related Rules

2015 National Ambient Air Quality Standards (NAAQS) for Ozone

2008 National Ambient Air Quality Standards (NAAQS) for Ozone

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

1997 National Ambient Air Quality Standards (NAAQS) for Ozone (revoked)

1997 Ozone National Ambient Air Quality Standards (NAAQS) Nonattainment Actions

Petitions

Ozone National Ambient Air Quality Standards (NAAQS) Section 126 Petitions