Approved Air Quality Implementation Plans in EPA's Pacific Southwest (Region 9)

EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, the Pacific Islands, and 148 Tribal Nations.

Arizona, California, Hawaii, Nevada, Pacific Islands, and Tribal Nations

EPA approved State Implementation Plans (SIPs), Tribal Implementation Plans (TIPs), and Federal Implementation Plans (FIPs) within EPA Region 9 states and territories.

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. If you find any errors in these files, or experience a problem reading a document with assistive technology, please contact us.

Federal Register Air Quality Notices

View All: Air Quality Notices in the Federal Register

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State Implementation Plans (SIPs)

Region 9 Air Plan Actions include federal action on SIPs to make them federally enforceable. SIPs may contain rules or regulations which control pollution from stationary, area, or mobile sources.

American Samoa

Arizona

California

Commonwealth of the Northern Mariana Islands

Guam

Hawai'i

Nevada

Tribal Implementation Plans (TIPs)

Federal Implementation Plans (FIPs)

Navajo Nation - Navajo Generating Station

Hawaii Regional Haze

Air Quality Implementation Plans

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Last updated on October 23, 2024