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Adjustments to Original 8-Hour Ozone (2015) Nonattainment Area Baseline
Adjustments to Original 8-Hour Ozone (2015) Nonattainment Area Baseline
Data is current as of March 31, 2024| BOUNDARY CHANGE |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| Chicago, IL-IN-WI - ILLINOIS |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| Chicago, IL-IN-WI - INDIANA |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| Chicago, IL-IN-WI - WISCONSIN |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| Manitowoc County, WI - WISCONSIN |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| Milwaukee, WI - WISCONSIN |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| Sheboygan County, WI - WISCONSIN |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| St. Louis, MO-IL - ILLINOIS |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| St. Louis, MO-IL - MISSOURI |
| November 30, 2021, Effective December 30, 2021 ( 86 FR 67864 ) |
| Denver Metro/North Front Range, CO - COLORADO |
| November 30, 2021, Effective December 30, 2021 ( 86 FR 67864 ) |
| El Paso-Las Cruces, TX-NM - TEXAS |
| CHANGE TO A HIGHER CLASSIFICATION (BUMP-UPS) |
| June 02, 2021, Effective July 02, 2021 ( 86 FR 29522 ) |
| San Diego County, CA - CALIFORNIA |
| Reclassify from Moderate to Severe 15 |
| DESIGNATION TO NONATTAINMENT |
| July 25, 2018, Effective September 24, 2018 ( 83 FR 35136 ) |
| San Antonio, TX - TEXAS |
| June 14, 2021, Effective July 14, 2021 ( 86 FR 31438 ) |
| Door County-Revised, WI - WISCONSIN |