Particulate Matter (PM-2.5) 1997 Standard Maintenance Areas
As of December 14, 2012| Chicago-Gary-Lake County, IL-IN (IN portion) |
| Cincinnati-Hamilton, OH-KY-IN |
| Evansville, IN |
| Greensboro-Winston Salem-High Point, NC |
| Hickory-Morganton-Lenoir, NC |
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