Approved Air Quality Implementation Plans in Region 8
Colorado, Montana, North Dakota, South Dakota, Utah, Wyoming and Tribal Nations
Use the tabs below to find approved State Implementation Plans (SIPs), Tribal Implementation Plans (TIPs), and Federal Implementation Plans (FIPs) within EPA Region 8 states listed above.
State Implementation Plans
Approved regulations, sources specific requirements, and non-regulatory provisions.
EPA-approved regulations and planning documents.
Tribal Implementation Plans
Region 8 currently has no approved TIPs.
Federal Implementation Plans
Uintah and Ouray Indian Reservation
The following links exit the site Exit
- Regional haze in Montana
- Sulfur Dioxide in Billings/Laurel, Montana
- Regional haze in North Dakota
- Regional haze in Wyoming