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:

• Ozone (2015)
• Ozone (2008)
• To find implementation information and guidance documents see Ozone (1997)
• General Preamble for the Implementation of Title 1 of the Clean Air Act Amendments of 1990

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

Final State Implementation Plan Submittal Deadlines and Implementation Requirements for Reclassified Nonattainment Areas Under the Ozone National Ambient Air Quality Standards

January 3, 2025 -  EPA is issuing a final rule that will streamline state planning and air quality protection requirements under the current and any future ozone National Ambient Air Quality Standards (NAAQS). This action will protect public health by clarifying steps needed to assure air quality standards are attained and maintained as required by the Clean Air Act (CAA).  Specifically, EPA is establishing:  

• universal default deadlines for submission of state implementation plan (SIP) revisions and for implementation of relevant control requirements that will apply for reclassified Moderate, Serious, and Severe nonattainment areas.  
• that, following reclassification, a state is no longer required to submit SIP revisions addressing certain requirements related to a nonattainment area’s prior classification, referred to as “leftover” SIP requirements.    

EPA is not reclassifying any ozone nonattainment areas as part of this action.

Final Rule: Final State Implementation Plan Submittal Deadlines and Implementation Requirements for Reclassified Nonattainment Areas Under the Ozone National Ambient Air Quality Standards

• Fact Sheet: Final State Implementation Plan Submittal Deadlines and Implementation Requirements for Reclassified Nonattainment Areas Under the Ozone National Ambient Air Quality Standards (pdf) (318.43 KB)

September 20, 2024: 

• Proposed Rule: State Implementation Plan Submittal Deadlines and Implementation Requirements for Reclassified Nonattainment Areas Under the Ozone National Ambient Air Quality Standards (pdf)(435.05 KB)