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Adjustments to Original PM-2.5 (1997) Nonattainment Area Baseline
Adjustments to Original PM-2.5 (1997) Nonattainment Area Baseline
Data is current as of November 30, 2025| CHANGE FROM SUBPART 1 TO SUBPART 4 |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Atlanta, GA - GEORGIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Baltimore, MD - MARYLAND |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Chattanooga, TN-GA-AL - ALABAMA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Chattanooga, TN-GA-AL - GEORGIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Chattanooga, TN-GA-AL - TENNESSEE |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Harrisburg-Lebanon-Carlisle, PA - PENNSYLVANIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Johnstown, PA - PENNSYLVANIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Knoxville, TN - TENNESSEE |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Lancaster, PA - PENNSYLVANIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Libby, MT - MONTANA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Liberty-Clairton, PA - PENNSYLVANIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Los Angeles-South Coast Air Basin, CA - CALIFORNIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Louisville, KY-IN - INDIANA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Louisville, KY-IN - KENTUCKY |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Martinsburg-Hagerstown, WV-MD - MARYLAND |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Philadelphia-Wilmington, PA-NJ-DE - DELAWARE |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Philadelphia-Wilmington, PA-NJ-DE - PENNSYLVANIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Pittsburgh-Beaver Valley, PA - PENNSYLVANIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Reading, PA - PENNSYLVANIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| San Joaquin Valley, CA - CALIFORNIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| St. Louis, MO-IL - ILLINOIS |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| St. Louis, MO-IL - MISSOURI |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Washington, DC-MD-VA - DISTRICT OF COLUMBIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Washington, DC-MD-VA - MARYLAND |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| Washington, DC-MD-VA - VIRGINIA |
| Change from Subpart 1 to Moderate |
| June 02, 2014, Effective July 02, 2014 ( 79 FR 31566 ) |
| York, PA - PENNSYLVANIA |
| Change from Subpart 1 to Moderate |
| CHANGE TO A HIGHER CLASSIFICATION (BUMP-UPS) |
| April 07, 2015, Effective May 07, 2015 ( 80 FR 18528 ) |
| San Joaquin Valley, CA - CALIFORNIA |
| Reclassify from Moderate to Serious |