Area Designations for 1997 and 2008 Ground-level Ozone Standards
Ground-level Ozone Designations Policy Guidance
Note: 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-designationsYou will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
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