Approved Air Quality Implementation Plans in Region 8
This site contains information about air quality regulations called State Implementation Plans (SIPs), Federal Implementation Plans (FIPs), and Tribal Implementation Plans (TIPs) approved by EPA Region 8.
State Implementation Plans
Approved regulations, sources specific requirements, and non-regulatory provisions.
EPA-approved regulations and planning documents.
Colorado
- EPA Approved Statutes and Regulations in the Colorado SIP
- EPA Approved Colorado Source-Specific Requirements
- EPA Approved Nonregulatory Provisions and Quasi-Regulatory Measures in the Colorado SIP
Montana
- EPA Approved Regulations in the Montana SIP
- EPA Approved Montana Source-Specific Requirements
- EPA Approved Nonregulatory Provisions and Quasi-Regulatory Measures in the Montana SIP
North Dakota
- EPA Approved Regulations in the North Dakota SIP
- EPA Approved North Dakota Source-Specific Requirements
- EPA Approved Nonregulatory Provisions and Quasi-Regulatory Measures in the North Dakota SIP
South Dakota
- EPA Approved Regulations in the South Dakota SIP
- EPA Approved South Dakota Source-Specific Requirements
- EPA Approved Nonregulatory Provisions and Quasi-Regulatory Measures in the South Dakota SIP
Utah
- EPA Approved Regulations in the Utah SIP
- EPA Approved Utah Source-Specific Requirements
- EPA Approved Nonregulatory Provisions and Quasi-Regulatory Measures in the Utah SIP
Wyoming
Federal Implementation Plans
Uintah and Ouray Indian Reservation
- FIP for Oil and Natural Gas Sources on the Uintah and Ouray Indian Reservation
- Regional haze in Montana
- Sulfur Dioxide in Billings/Laurel, Montana
- Regional haze in North Dakota
- Regional haze in Wyoming
Fort Berthold Indian Reservation (Madan, Hidatsa, and Arikara Nations)
About this website: The official SIPs, TIPs, and FIPs are contained in regulations promulgated in the Federal Register and codified in the U.S. Code of Federal Regulations (CFR). EPA’s web-versions of the approved SIPs, TIPs, and FIPs are for reference. While we make every effort to maintain the accuracy of the files accessible here, inconsistencies may occur. Please contact us using the link below if you find any errors in these files.