States that are Affected by the Cross-State Air Pollution Rule (CSAPR)
| State | Required to Reduce Emissions of NOX during the Ozone Season (1997 Ozone NAAQS) | Required to Reduce Emissions of NOX during the Ozone Season (2008 Ozone NAAQS) | Required to Reduce Annual Emissions of SO2 and NOX (1997 Annual PM2.5 NAAQS) | Required to Reduce Annual Emissions of SO2 and NOX (2006 24-Hour PM2.5 NAAQS) | *SO2 Group |
|---|---|---|---|---|---|
| Alabama | X | X | X | 2 | |
| Arkansas | X | ||||
| Georgia | X | X | X | 2 | |
| Illinois | X | X | X | 1 | |
| Indiana | X | X | X | 1 | |
| Iowa | X | X | X | 1 | |
| Kansas | X | X | 2 | ||
| Kentucky | X | X | X | 1 | |
| Louisiana | X | ||||
| Maryland | X | X | X | 1 | |
| Michigan | X | X | X | 1 | |
| Minnesota | X | 2 | |||
| Mississippi | X | ||||
| Missouri | X | X | X | 1 | |
| Nebraska | X | 2 | |||
| New Jersey | X | X | 1 | ||
| New York | X | X | X | 1 | |
| North Carolina | X | X | 1 | ||
| Ohio | X | X | X | 1 | |
| Oklahoma | X | ||||
| Pennsylvania | X | X | X | 1 | |
| South Carolina | X | 2 | |||
| Tennessee | X | X | X | 1 | |
| Texas | X | ||||
| Virginia | X | X | 1 | ||
| West Virginia | X | X | X | 1 | |
| Wisconsin | X | X | X | 1 | |
| Number of States | 1 | 22 | 17 | 21 |
* The final CSAPR divides the states required to reduce SO2 into two groups. Both groups must reduce their SO2 emissions beginning in Phase I. Group 1 states must make significant additional reductions in SO2 emissions for Phase II in order to eliminate their significant contribution to air quality problems in downwind areas.