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Area Designations for 1997 and 2008 Ground-level Ozone Standards

Ground-level Ozone Designations Policy Guidance

Information provided for informational purposes onlyNote: EPA no longer updates this information, but it may be useful as a reference or resource. For the latest information on ground level ozone designations, see www.epa.gov/ozone-designations

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2008 Standards

Guidance to Regions for Working with Tribes During the National Ambient Air Quality Standards (NAAQS) Designations Process (PDF) (10pp, 696k) - December 20, 2011

Policy for Establishing Separate Air Quality Designations for Areas of Indian Country (PDF) (16pp, 1.1 MB) - December 20, 2011

Implementation of the Ozone National Ambient Air Quality Standard (PDF) (4pp, 988 kb) September 22, 2011

Area Designations for the 2008 Revised Ozone National Ambient Air Quality Standards (PDF) (6 pp, 99KB) December 4, 2008

1997 Standards

Extension for States and Tribes to Submit Air Quality Designation Recommendations for the 8-Hour Ozone National Ambient Air Quality Standards (NAAQS) (PDF) (3 pp, 780KB) February 27, 2003

Schedule for 8-Hour Ozone Designations and its Effect on Early Action Compacts (PDF) (9 pp, 154KB) November 14, 2002

Guidance on 8-Hour Ozone Designations for Indian Tribes (PDF) (8 pp, 453KB) July 18, 2000

Guidance for Determining Boundaries of 8-Hour Ozone Attainment and Nonattainment Areas (PDF) (3 pp, 25KB) March 28, 2000

Boundary Guidance on Air Quality Designations for the 8-Hour Ozone National Ambient Air Quality Standards (PDF) (12 pp, 61KB) March 28, 2000

8-Hour Designations (EPA status update) (PDF) (2 pp, 16KB) March 28, 2000

A-99-29 I-B EPA Correspondence to Persons Outside the Agency

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