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  2. Particle Pollution Designations

PM2.5 Designations - Tribal Recommendations and EPA Responses

The National Tribal Environmental Council and that Tribal Council's workgroup, The National Designation and Implementation Work Group have been addressing Tribal issues with respect to the designation process.

The documents listed below are Tribes' initial designations, if applicable, and EPA's responses for the 2024 annual PM2.5 NAAQS. The EPA intends to finalize designations for all Tribal areas in a separate future action.

  • Notice of Availability and Public Comment Period: EPA Response to State Initial Designations for the 2024 Annual Primary PM2.5 NAAQS (pdf) (220.87 KB)

Tribal recommendations and EPA's responses are available below.

Tribe

Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservation, California 

  • EPA 120-Day Letter (pdf) (274.93 KB)

Ak-Chin Indian Community

  • EPA 120-Day Letter (pdf) (275.99 KB)

Augustine Band of Cahuilla Indians, California

  • EPA 120-Day Letter (pdf) (274.91 KB)

Big Sandy Rancheria of Western Mono Indians of California

  • EPA 120-Day Letter (pdf) (278.38 KB)

Cabazon Band of Cahuilla Indians

  • EPA 120-Day Letter (pdf) (275.07 KB)

Cahuilla Band of Indians

  • EPA 120-Day Letter (pdf) (274.86 KB)

Campo Band of Diegueno Mission Indians of the Campo Indian Reservation, California

  • EPA 120-Day Letter (pdf) (275.01 KB)

Capitan Grande Band of Diegueno Mission Indians of California: Barona Group of Capitan Grande Band of Mission Indians of the Barona Reservation, California

  • EPA 120-Day Letter (pdf) (275.09 KB)

Capitan Grande Band of Diegueno Mission Indians of California: Viejas (Baron Long) Group of Capitan Grande Band of Mission Indians of the Viejas Reservation, California

  • EPA 120-Day Letter (pdf) (284.82 KB)

Chemehuevi Indian Tribe of the Chemehuevi Reservation, California

  • EPA 120-Day Letter (pdf) (274.98 KB)

Cherokee Nation

  • EPA 120-Day Letter (pdf) (2.2 MB)

Cold Springs Rancheria of Mono Indians of California

  • EPA 120-Day Letter (pdf) (274.87 KB)

Colorado River Indian Tribes of the Colorado River Indian Reservation, Arizona and California

  • EPA 120-Day Letter (pdf) (275.04 KB)

Eastern Shawnee Tribe of Oklahoma

  • EPA 120-Day Letter (pdf) (2.2 MB)

Ewiiaapaayp Band of Kumeyaay Indians, California

  • EPA 120-Day Letter (pdf) (274.87 KB)

Federated Indians of Graton Rancheria

  • EPA 120-Day Letter (pdf) (274.92 KB)

Fort McDowell Yavapai Nation Reservation

  • EPA 120-Day Letter (pdf) (275.22 KB)

Fort Mojave Indian Tribe of Arizona, California & Nevada

  • EPA 120-Day Letter (pdf) (274.76 KB)

Gila River Indian Community of the Gila River Indian Reservation, Arizona

  • Initial Designation Letter (pdf) (2.37 MB)
  • EPA 120-Day Letter (pdf) (287.63 KB)

Greenville Rancheria

  • EPA 120-Day Letter (pdf) (274.59 KB)

Iipay Nation of Santa Ysabel, California

  • EPA 120-Day Letter (pdf) (284.47 KB)

Inaja Band of Diegueno Mission Indians of the Inaja and Cosmit Reservation, California

  • EPA 120-Day Letter (pdf) (274.82 KB)

Jamul Indian Village of California

  • EPA 120-Day Letter (pdf) (284.57 KB)

La Jolla Band of Luiseno Indians, California

  • EPA 120-Day Letter (pdf) (285.43 KB)

La Posta Band of Diegueno Mission Indians of the La Posta Indian Reservation, California

  • EPA 120-Day Letter (pdf) (283.99 KB)

Los Coyotes Band of Cahuilla and Cupeno Indians, California

  • EPA 120-Day Letter (pdf) (284.66 KB)

Lytton Rancheria of California

  • EPA 120-Day Letter (pdf) (291.92 KB)

Manzanita Band of Diegueno Mission Indians of the Manzanita Reservation, California

  • EPA 120-Day Letter (pdf) (284.62 KB)

Mesa Grande Band of Diegueno Mission Indians of the Mesa Grande Reservation, California

  • EPA 120-Day Letter (pdf) (284.69 KB)

Miami Tribe of Oklahoma

  • EPA 120-Day Letter (pdf) (2.21 MB)

Mississippi Band of Choctaw Indians

  • EPA 120-Day Letter (pdf) (259.02 KB)

Modoc Nation

  • EPA 120-Day Letter (pdf) (2.19 MB)

Morongo Band of Mission Indians, California (CA)

  • Initial Designation Letter (pdf) (478.67 KB)
  • EPA 120-Day Letter (pdf) (282.41 KB)

Northfork Rancheria of Mono Indians of California

  • EPA 120-Day Letter (pdf) (285.47 KB)

Ottawa Tribe of Oklahoma

  • EPA 120-Day Letter (pdf) (2.23 MB)

Pala Band of Mission Indians

  • EPA 120-Day Letter (pdf) (284.57 KB)

Pascua Yaqui Tribe of Arizona

  • EPA 120-Day Letter (pdf) (284.81 KB)

Pauma Band of Luiseno Mission Indians of the Pauma & Yuima Reservation, California

  • EPA 120-Day Letter (pdf) (285.53 KB)

Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, California

  • Initial Designation Letter (pdf) (230.61 KB)
  • EPA 120-Day Letter (pdf) (286.5 KB)

Peoria Tribe of Indians of Oklahoma

  • EPA 120-Day Letter (pdf) (2.23 MB)

Picayune Rancheria of Chukchansi Indians of California

  • EPA 120-Day Letter (pdf) (284.49 KB)

Prairie Island Indian Community in the State of Minnesota

  • EPA 120-Day Letter (pdf) (268.26 KB)

Quapaw Nation

  • EPA 120-Day Letter (pdf) (2.2 MB)

Quechan Tribe of the Fort Yuma Indian Reservation, California & Arizona

  • EPA 120-Day Letter (pdf) (284.46 KB)

Ramona Band of Cahuilla, California

  • EPA 120-Day Letter (pdf) (284.46 KB)

Rincon Band of Luiseno Indians

  • EPA 120-Day Letter (pdf) (288.17 KB)

Salt River Pima-Maricopa Indian Community of the Salt River Reservation, Arizona

  • EPA 120-Day Letter (pdf) (308.76 KB)

San Carlos Apache Tribe of the San Carlos Reservation, Arizona

  • EPA 120-Day Letter (pdf) (284.72 KB)

San Pasqual Band of Diegueno Mission Indians of California

  • EPA 120-Day Letter (pdf) (284.56 KB)

Santa Rosa Band of Cahuilla Indians, California

  • EPA 120-Day Letter (pdf) (284.51 KB)

Santa Rosa Indian Community of the Santa Rosa Rancheria, California

  • EPA 120-Day Letter (pdf) (284.46 KB)

Seneca-Cayuga Nation

  • EPA 120-Day Letter (pdf) (2.21 MB)

Shakopee Mdewakanton Sioux Community of Minnesota

  • EPA 120-Day Letter (pdf) (267.18 KB)

Shoshone-Bannock Tribes of the Fort Hall Reservation

  • EPA 120-Day Letter (pdf) (300.12 KB)

Soboba Band of Luiseno Indians, California

  • EPA 120-Day Letter (pdf) (284.32 KB)

Sycuan Band of the Kumeyaay Nation

  • EPA 120-Day Letter (pdf) (284.44 KB)

Table Mountain Rancheria

  • EPA 120-Day Letter (pdf) (284.47 KB)

Tejon Indian Tribe

  • EPA 120-Day Letter (pdf) (284.43 KB)

Tohono O'odham Nation of Arizona

  • EPA 120-Day Letter (pdf) (284.84 KB)

Tonto Apache

  • EPA 120-Day Letter (pdf) (285.08 KB)

Torres Martinez Desert Cahuilla Indians, California

  • EPA 120-Day Letter (pdf) (284.59 KB)

Tule River Indian Tribe of the Tule River Reservation, California

  • EPA 120-Day Letter (pdf) (284.5 KB)

Twenty-Nine Palms Band of Mission Indians of California

  • EPA 120-Day Letter (pdf) (284.61 KB)

White Mountain Apache Tribe of the Fort Apache Reservation, Arizona

  • EPA 120-Day Letter (pdf) (284.85 KB)

Wyandotte Nation

  • EPA 120-Day Letter (pdf) (2.21 MB)

Ysleta del Sur Pueblo

  • EPA 120-Day Letter (pdf) (2.19 MB)

Yuhaaviatam of San Manuel Nation

  • EPA 120-Day Letter (pdf) (284.53 KB)

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Last updated on October 2, 2026
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