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40 C.F.R. § 81.327

Montana.

§ 81.327 Montana.

Montana—1971 Sulfur Dioxide NAAQS

[Primary and Secondary]

Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
Laurel AreaX
East Helena AreaX
Anaconda AreaX
Rest of StateX

Montana—2010 Sulfur Dioxide NAAQS

[Primary]

Designated area 1Designation
Date 2Type
Yellowstone County (part)5/10/16Attainment.
The area originates at the point defined as the southwest corner of Section 11, Township 1S, Range 26E. From that point the boundary proceeds north along the western section line of Section 11 to the point of intersection with the midline of Interstate Highway 90. From that point the boundary follows the midline of Interstate Highway 90, across the Yellowstone River, to the point where the highway midline intersects the northern boundary of Section 35, Township 1N, Range 26E. From that point the boundary proceeds east along the northern section line of Sections 35 and 36 to the point where Old US 87/Hardin Road leaves the section line and turns southeast. The boundary follows the midline of Old US 87/Hardin Road southeast to the point where the road intersects the western boundary of the SE 1⁄4 of the SE 1⁄4 of Section 31, Township 1N, Range 27E. From that point the boundary proceeds south along the 1⁄4 section line to the southern boundary of Township 1N, then east to the northeast corner of Section 5, Township 1S, Range 27E. The boundary then proceeds south along the eastern section line of sections 5 and 8 to the southeast corner of Section 8, Township 1S, Range 27E, where it turns west and follows the south section line of Sections 8 and 7, Township 1S, Range 27E; and Sections 12 and 11, Township 1S, Range 26E, back to the point of origin
Beaverhead CountyAttainment/Unclassifiable.
Big Horn CountyAttainment/Unclassifiable.
Blaine CountyAttainment/Unclassifiable.
Broadwater CountyAttainment/Unclassifiable.
Carbon CountyAttainment/Unclassifiable.
Carter CountyAttainment/Unclassifiable.
Cascade CountyAttainment/Unclassifiable.
Chouteau CountyAttainment/Unclassifiable.
Custer CountyAttainment/Unclassifiable.
Daniels CountyAttainment/Unclassifiable.
Dawson CountyAttainment/Unclassifiable.
Deer Lodge CountyAttainment/Unclassifiable.
Fallon CountyAttainment/Unclassifiable.
Fergus CountyAttainment/Unclassifiable.
Flathead CountyAttainment/Unclassifiable.
Gallatin CountyAttainment/Unclassifiable.
Garfield CountyAttainment/Unclassifiable.
Glacier CountyAttainment/Unclassifiable.
Golden Valley CountyAttainment/Unclassifiable.
Granite CountyAttainment/Unclassifiable.
Hill CountyAttainment/Unclassifiable.
Jefferson CountyAttainment/Unclassifiable.
Judith Basin CountyAttainment/Unclassifiable.
Lake CountyAttainment/Unclassifiable.
Lewis and Clark CountyAttainment/Unclassifiable.
Liberty CountyAttainment/Unclassifiable.
Lincoln CountyAttainment/Unclassifiable.
McCone CountyAttainment/Unclassifiable.
Madison CountyAttainment/Unclassifiable.
Meagher CountyAttainment/Unclassifiable.
Mineral CountyAttainment/Unclassifiable.
Missoula CountyAttainment/Unclassifiable.
Musselshell CountyAttainment/Unclassifiable.
Park CountyAttainment/Unclassifiable.
Petroleum CountyAttainment/Unclassifiable.
Phillips CountyAttainment/Unclassifiable.
Pondera CountyAttainment/Unclassifiable.
Powder River CountyAttainment/Unclassifiable.
Powell CountyAttainment/Unclassifiable.
Prairie CountyAttainment/Unclassifiable.
Ravalli CountyAttainment/Unclassifiable.
Richland CountyAttainment/Unclassifiable.
Roosevelt CountyAttainment/Unclassifiable.
Rosebud CountyAttainment/Unclassifiable.
Sanders CountyAttainment/Unclassifiable.
Sheridan CountyAttainment/Unclassifiable.
Silver Bow CountyAttainment/Unclassifiable.
Stillwater CountyAttainment/Unclassifiable.
Sweet Grass CountyAttainment/Unclassifiable.
Teton CountyAttainment/Unclassifiable.
Toole CountyAttainment/Unclassifiable.
Treasure CountyAttainment/Unclassifiable.
Valley CountyAttainment/Unclassifiable.
Wheatland CountyAttainment/Unclassifiable.
Wibaux CountyAttainment/Unclassifiable.
Yellowstone County (part) (remainder)Attainment/Unclassifiable.

1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

2 This date is April 9, 2018, unless otherwise noted.

Montana—Carbon Monoxide

Designated Area Designation Classification
Date 1Type Date 1Type
Billings Area
Yellowstone County (part):
The following areas of Yellowstone Co. (Range and Township) sections: R25E T1N—Sections 24 through 27 and 34 through 36; R25E T1S—Sections 1, 2, and 12; R26E T1N Sections 19 through 22 and 27 through 34; R26E T1S Sections 2 through 11 and 15 through 18.April 22, 2002.Attainment
Great Falls AreaJuly 8, 2002Attainment
Cascade County (part)
Great Falls designated area: North boundary—9th Avenue South or its straight line extension; East boundary—54th Street South or its straight line extension; South boundary—11th Avenue South or its straight line extension; West boundary—2nd Street South or its straight line extension
Missoula Area:
Missoula County (part)September 17, 2007Attainment
Missoula and vicinity including the following (Range and Township) sections: R19W T14N—sections: 29 and 32; R19W T13N—sections 2, 5, 7, 8, 11, 14 through 24, and 26 through 34; R19W T12N—sections: 4 through 7; R20W T13N—sections: 23 through 26, 35 and 36
Beaverhead CountyUnclassifiable/Attainment
Big Horn County (part)
excluding Crow, Northern Cheyenne Indian Reservations		Unclassifiable/Attainment
Blaine County (part)
excluding Fort Belknap Indian Reservation		Unclassifiable/Attainment
Broadwater CountyUnclassifiable/Attainment
Carbon CountyUnclassifiable/Attainment
Carter CountyUnclassifiable/Attainment
Cascade County (part)
Remainder of Cascade CountyUnclassifiable/Attainment
Chouteau County (part)
excluding Rocky Boy Indian Reservation		Unclassifiable/Attainment
Custer CountyUnclassifiable/Attainment
Daniels County (part)
excluding Fort Peck Indian Reservation		Unclassifiable/Attainment
Dawson CountyUnclassifiable/Attainment
Deer Lodge CountyUnclassifiable/Attainment
Fallon CountyUnclassifiable/Attainment
Fergus CountyUnclassifiable/Attainment
Flathead County (part)
excluding Flathead Indian Resevation		Unclassifiable/Attainment
Gallatin CountyUnclassifiable/Attainment
Garfield CountyUnclassifiable/Attainment
Glacier County (part)
excluding Blackfeet Indian Reservation		Unclassifiable/Attainment
Golden Valley CountyUnclassifiable/Attainment
Granite CountyUnclassifiable/Attainment
Hill County (part)
excluding Rocky Boy Indian Reservation		Unclassifiable/Attainment
Jefferson CountyUnclassifiable/Attainment
Judith Basin CountyUnclassifiable/Attainment
Lake County (part)
excluding Flathead Indian Reservation		Unclassifiable/Attainment
Lewis and Clark CountyUnclassifiable/Attainment
Liberty CountyUnclassifiable/Attainment
Lincoln CountyUnclassifiable/Attainment
Madison CountyUnclassifiable/Attainment
McCone CountyUnclassifiable/Attainment
Meagher CountyUnclassifiable/Attainment
Mineral CountyUnclassifiable/Attainment
Missoula County (part)
Remainder of Missoula CountyUnclassifiable/Attainment
Musselshell CountyUnclassifiable/Attainment
Park CountyUnclassifiable/Attainment
Petroleum CountyUnclassifiable/Attainment
Phillips County (part)
excluding Fort Belknap Indian Reservation		Unclassifiable/Attainment
Pondera County (part)
excluding Blackfeet Indian Reservation		Unclassifiable/Attainment
Powder River CountyUnclassifiable/Attainment
Powell CountyUnclassifiable/Attainment
Prairie CountyUnclassifiable/Attainment
Ravalli CountyUnclassifiable/Attainment
Richland CountyUnclassifiable/Attainment
Roosevelt County (part)
excluding Fort Peck Indian Reservation		Unclassifiable/Attainment
Rosebud County (part)
excluding Northern Cheyenne Indian Reservation		Unclassifiable/Attainment
Sanders County (part)
excluding Flathead Indian Reservation		Unclassifiable/Attainment
Sheridan County (part)
excluding Fort Peck Indian Reservation		Unclassifiable/Attainment
Silver Bow CountyUnclassifiable/Attainment
Stillwater CountyUnclassifiable/Attainment
Sweet Grass CountyUnclassifiable/Attainment
Teton CountyUnclassifiable/Attainment
Toole CountyUnclassifiable/Attainment
Treasure CountyUnclassifiable/Attainment
Valley County (part)
excluding Fort Peck Indian Reservation		Unclassifiable/Attainment
Wheatland CountyUnclassifiable/Attainment
Wibaux CountyUnclassifiable/Attainment
Yellowstone County (part)
Remainder of Yellowstone CountyUnclassifiable/Attainment
Yellowstone National ParkUnclassifiable/Attainment
Blackfeet Indian ReservationUnclassifiable/Attainment
Glacier County (part)
area inside Blackfeet Reservation
Pondera County (part)
area inside Blackfeet Reservation
Crow Indian ReservationUnclassifiable/Attainment
Bighorn County (part)
area inside Crow Reservation
Yellowstone (part)
area inside Crow Reservation
Flathead Indian ReservationUnclassifiable/Attainment
Flathead County (part)
area inside Flathead Reservation
Lake County (part)
area inside Flathead Reservation
Missoula County (part)
area inside Flathead Reservation
Sanders County (part)
area inside Flathead Reservation
Fort Belknap Indian ReservationUnclassifiable/Attainment
Blaine County (part)
area inside Fort Belknap Reservation
Phillips County (part)
area inside Fort Belknap Reservation
Fort Peck Indian ReservationUnclassifiable/Attainment
Daniels County (part)
area inside Fort Peck Reservation
Roosevelt County (part)
area inside Fort Peck Reservation
Sheridan County (part)
area inside Fort Peck Reservation
Valley County (part)
area inside Fort Peck Reservation
Northern Cheyenne Indian ReservationUnclassifiable/Attainment
Bighorn County (part)
area inside Northern Cheyenne Reservation
Rosebud County (part)
area inside Northern Cheyenne Reservation
Rocky Boy Indian ReservationUnclassifiable/Attainment
Chouteau County (part)
area inside Rocky Boy Reservation
Hill County (part)
area inside Rocky Boy Reservation
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