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Montana Nonattainment/Maintenance Status for Each County by Year for All Criteria Pollutants

Data is current as of August 31, 2024

Listed by County, NAAQS, Area. The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.

* The 1997 Primary Annual PM-2.5 NAAQS (level of 15 µg/m3) is revoked in attainment and maintenance areas for that NAAQS. For additional information see the PM-2.5 NAAQS SIP Requirements Final Rule, effective October 24, 2016. (81 FR 58009)

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Important Notes Download National Dataset: dbf   |   xls    |   Data dictionary (PDF)
County NAAQS Area Name Nonattainment in Year Redesignation
to Maintenance		 Classification Whole or/
Part County		 Population
(2010)		 State/
County
FIPS Codes
MONTANA
Cascade County Carbon Monoxide (1971) Great Falls, MT
92 93 94 95 96 97 98 99 00 01                                                                                                                   
07/08/2002 Not Classified Part 57,573 30/013
Flathead County PM-10 (1987) Flathead County; Columbia Falls and vicinity, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19                         
07/27/2020 Moderate Part 4,610 30/029
Flathead County PM-10 (1987) Flathead County; Kalispell and vicinity, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19                         
07/27/2020 Moderate Part 18,422 30/029
Flathead County PM-10 (1987) Flathead County; Whitefish and vicinity, MT
     93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21               
07/08/2022 Moderate Part 6,138 30/029
Lake County PM-10 (1987) Lake County; Polson, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/ / Moderate Part 4,099 30/047
Lake County PM-10 (1987) Lake County; Ronan, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/ / Moderate Part 2,734 30/047
Lewis and Clark County Lead (1978) Lewis & Clark County (part); City of East Helena and vicinity, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18                              
10/11/2019   Part 2,669 30/049
Lewis and Clark County Sulfur Dioxide (1971) East Helena Area, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18                              
10/11/2019   Part 2,669 30/049
Lincoln County PM-10 (1987) Lincoln County; Libby and vicinity, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19                         
07/27/2020 Moderate Part 3,378 30/053
Lincoln County PM-2.5 (1997)-NAAQS revoked Libby, MT
                                                                 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22          
08/23/2023 * Moderate Part 9,429 30/053
Missoula County Carbon Monoxide (1971) Missoula, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06                                                                                          
09/17/2007 Moderate <= 12.7ppm Part 59,733 30/063
Missoula County PM-10 (1987) Missoula, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18                              
06/24/2019 Moderate Part 59,733 30/063
Rosebud County PM-10 (1987) Rosebud County; Lame Deer, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/ / Moderate Part 527 30/087
Sanders County PM-10 (1987) Sanders County (part); Thompson Falls and vicinity, MT
          94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21               
07/08/2022 Moderate Part 1,317 30/089
Silver Bow County PM-10 (1987) Silver Bow County; Butte, MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20                    
07/26/2021 Moderate Part 34,201 30/093
Yellowstone County Carbon Monoxide (1971) Billings, MT
92 93 94 95 96 97 98 99 00 01                                                                                                                   
04/22/2002 Not Classified Part 104,360 30/111
Yellowstone County Sulfur Dioxide (1971) Laurel Area (Yellowstone County), MT
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/ /   Part 6,525 30/111
Yellowstone County Sulfur Dioxide (2010) Billings, MT
                                                                                                         13 14 15                                             
06/09/2016   Part 2,621 30/111
Important Notes

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