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Ozone (O₃) Standards

The Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for ozone and five other pollutants considered harmful to public health and the environment (the other pollutants are particulate matter, nitrogen oxides, carbon monoxide, sulfur dioxide and lead). The law also requires EPA to periodically review the standards to ensure that they provide adequate health and environmental protection, and to update those standards as necessary. Learn more about the NAAQS review process.

Contact:

Susan Lyon Stone stone.susan@epa.gov 919-541-1146

Documents from Current Review

• Planning Documents
• Integrated Science Assessments
• Risk and Exposure Assessments
• Policy Assessments
• Other Technical Documents
• CASAC Documents
• Federal Register Notices
• Response to Comments Document
• Regulatory Impact Analysis
• Litigation

Basic Information on Ground-level Ozone

Documents from Review Completed in 2008 (including documents related to the reconsideration)

Documents from Review Completed in 1997

Documents from Previous Reviews

Table of Current NAAQS

Table of Historical Ozone NAAQS

Air Quality Index

 

File Utilities

Area Navigation

• NAAQS Home
  
• Carbon Monoxide Standards
• Carbon Monoxide Implementation
  
• Lead Standards
• Lead Implementation
  
• Nitrogen Dioxide Primary Standards
• Nitrogen Dioxide Secondary Standards
• Nitrogen Dioxide Implementation
  
• Ozone Standards
• Ozone Implementation
  
• Particulate Matter Standards
• PM Implementation
  
• Sulfur Dioxide Primary Standards
• Sulfur Dioxide Secondary Standards
• Sulfur Dioxide Implementation