| Rank | Air Quality Index ▼ | School District / Population |
| 1. | 45.5 | Noxon Elementary School District / 1,502 |
| 2. | 45.3 | Troy Elementary School District / 2,629 |
| 3. | 45.2 | Noxon High School District / 2,403 |
| 4. | 44.9 | Dillon Elementary School District / 7,763 |
| 5. | 44.8 | McCormick Elementary School District / 500 |
| 6. | 44.7 | West Yellowstone K-12 School District / 2,041 |
| 7. | 44.6 | Jackson Elementary School District / 129 |
| 7. | 44.6 | Polaris Elementary School District / 85 |
| 7. | 44.6 | Beaverhead County High School District / 8,772 |
| 7. | 44.6 | Alder Elementary School District / 272 |
| 7. | 44.6 | Reichle Elementary School District / 127 |
| 12. | 44.5 | Lincoln County High School District / 6,459 |
| 12. | 44.5 | Eureka Elementary School District / 4,808 |
| 14. | 44.5 | Sheridan High School District / 1,650 |
| 14. | 44.5 | Grant Elementary School District / 76 |
| 14. | 44.5 | Ennis K-12 Schools / 3,483 |
| 14. | 44.5 | Libby K-12 Schools / 9,600 |
| 18. | 44.2 | Sheridan Elementary School District / 1,378 |
| 18. | 44.2 | Ophir Elementary School District / 2,153 |
| 18. | 44.2 | Gardiner Elementary School District / 1,733 |
| 18. | 44.2 | Twin Bridges K-12 Schools / 1,382 |
| 22. | 44.1 | Wisdom Elementary School District / 285 |
| 23. | 43.9 | Cottonwood Elementary School District / 193 |
| 23. | 43.9 | Gallatin Gateway Elementary School District / 1,711 |
| 23. | 43.9 | Cardwell Elementary School District / 435 |
| 23. | 43.9 | Park High School District / 12,483 |
| 23. | 43.9 | Livingston Elementary School District / 10,129 |
| 23. | 43.9 | La Motte Elementary School District / 778 |
| 23. | 43.9 | Bozeman High School District / 59,840 |
| 23. | 43.9 | Harrison K-12 Schools / 749 |
| 23. | 43.9 | Bozeman Elementary School District / 53,316 |
| 23. | 43.9 | Three Forks High School District / 3,381 |
| 23. | 43.9 | Manhattan High School District / 4,431 |
| 23. | 43.9 | Gardiner High School District / 1,776 |
| 23. | 43.9 | Whitehall High School District / 3,793 |
| 23. | 43.9 | Cooke City Elementary School District / 43 |
| 23. | 43.9 | Willow Creek High School District / 315 |
| 23. | 43.9 | Springdale Elementary School District / 210 |
| 23. | 43.9 | Willow Creek Elementary School District / 368 |
| 23. | 43.9 | Amsterdam Elementary School District / 2,008 |
| 23. | 43.9 | Anderson Elementary School District / 1,397 |
| 23. | 43.9 | Arrowhead Elementary School District / 1,718 |
| 23. | 43.9 | Pine Creek Elementary School District / 448 |
| 23. | 43.9 | Nye Elementary School District / 210 |
| 23. | 43.9 | Monforton Elementary School District / 2,232 |
| 23. | 43.9 | Three Forks Elementary School District / 3,485 |
| 23. | 43.9 | Belgrade High School District / 20,718 |
| 23. | 43.9 | McLeod Elementary School District / 240 |
| 23. | 43.9 | Belgrade Elementary School District / 20,497 |
| 23. | 43.9 | Malmborg Elementary School District / 213 |
| 23. | 43.9 | Springhill Elementary School District / 148 |
| 23. | 43.9 | Manhattan Elementary School District / 2,390 |
| 53. | 43.8 | Rapelje Elementary School District / 348 |
| 54. | 43.7 | Lima K-12 Schools / 522 |
| 55. | 43.6 | Park City High School District / 2,061 |
| 55. | 43.6 | Fromberg K-12 Schools / 1,030 |
| 55. | 43.6 | Joliet Elementary School District / 2,089 |
| 55. | 43.6 | Bridger K-12 Schools / 1,739 |
| 55. | 43.6 | Joliet High School District / 2,414 |
| 55. | 43.6 | Rapelje High School District / 455 |
| 55. | 43.6 | Park City Elementary School District / 2,265 |
| 55. | 43.6 | Shields Valley High School District / 1,705 |
| 55. | 43.6 | Shields Valley Elementary School District / 1,705 |
| 64. | 43.5 | Fishtail Elementary School District / 392 |
| 64. | 43.5 | Trout Creek Elementary School District / 901 |
| 64. | 43.5 | Melville Elementary School District / 237 |
| 67. | 43.5 | Lodge Grass High School District / 1,841 |
| 67. | 43.5 | Belfry K-12 Schools / 628 |
| 69. | 43.4 | Whitehall Elementary School District / 3,215 |
| 69. | 43.4 | Lodge Grass Elementary School District / 1,467 |
| 69. | 43.4 | Absarokee High School District / 2,076 |
| 69. | 43.4 | Red Lodge High School District / 3,631 |
| 69. | 43.4 | Columbus High School District / 3,958 |
| 69. | 43.4 | Reedpoint Elementary School District / 718 |
| 69. | 43.4 | Reedpoint High School District / 711 |
| 69. | 43.4 | Luther Elementary School District / 385 |
| 69. | 43.4 | Absarokee Elementary School District / 1,608 |
| 69. | 43.4 | Spring Creek Elementary School District / 44 |
| 69. | 43.4 | Roberts K-12 Schools / 747 |
| 69. | 43.4 | Columbus Elementary School District / 3,754 |
| 81. | 43.3 | Ramsay Elementary School District / 1,114 |
| 81. | 43.3 | Melrose Elementary School District / 97 |
| 81. | 43.3 | Sweet Grass County High School District / 3,511 |
| 81. | 43.3 | Wise River Elementary School District / 383 |
| 81. | 43.3 | Big Timber Elementary School District / 2,771 |
| 81. | 43.3 | Greycliff Elementary School District / 234 |
| 81. | 43.3 | Grass Range Elementary School District / 420 |
| 81. | 43.3 | Divide Elementary School District / 170 |
| 81. | 43.3 | Butte Elementary School District / 33,054 |
| 81. | 43.3 | Butte High School District / 34,435 |
| 81. | 43.3 | Grass Range High School District / 488 |
| 92. | 43.2 | Hardin Elementary School District / 10,144 |
| 92. | 43.2 | Ayers Elementary School District / 68 |
| 94. | 43.1 | Hardin High School District / 8,868 |
| 94. | 43.1 | Troy High School District / 3,396 |
| 94. | 43.1 | Sylvanite Elementary School District / 134 |
| 94. | 43.1 | Wyola Elementary School District / 374 |
| 94. | 43.1 | Red Lodge Elementary School District / 3,112 |
| 99. | 43.0 | Plenty Coups High School District / 739 |
| 99. | 43.0 | Yellowstone Academy Elementary School District / 115 |
| 99. | 43.0 | Canyon Creek Elementary School District / 2,315 |
| 99. | 43.0 | Winnett K-12 Schools / 489 |
| 99. | 43.0 | Morin Elementary School District / 397 |
| 99. | 43.0 | Lockwood Elementary School District / 8,067 |
| 99. | 43.0 | Blue Creek Elementary School District / 2,052 |
| 99. | 43.0 | Laurel Elementary School District / 10,438 |
| 99. | 43.0 | Billings High School District / 133,015 |
| 99. | 43.0 | Billings Elementary School District / 111,515 |
| 99. | 43.0 | Broadview Elementary School District / 893 |
| 99. | 43.0 | Independent Elementary School District / 2,659 |
| 99. | 43.0 | Molt Elementary School District / 157 |
| 99. | 43.0 | Huntley Project K-12 Schools / 3,538 |
| 99. | 43.0 | Yaak Elementary School District / 267 |
| 99. | 43.0 | Laurel High School District / 10,113 |
| 99. | 43.0 | Elder Grove Elementary School District / 3,410 |
| 99. | 43.0 | Melstone High School District / 179 |
| 99. | 43.0 | Broadview High School District / 943 |
| 99. | 43.0 | Pryor Elementary School District / 739 |
| 99. | 43.0 | Shepherd High School District / 4,069 |
| 99. | 43.0 | Pioneer Elementary School District / 1,147 |
| 99. | 43.0 | Elysian Elementary School District / 1,338 |
| 99. | 43.0 | Shepherd Elementary School District / 4,069 |
| 123. | 42.9 | Roundup High School District / 4,551 |
| 123. | 42.9 | Ryegate K-12 Schools / 353 |
| 123. | 42.9 | Melstone Elementary School District / 402 |
| 123. | 42.9 | Hysham K-12 Schools / 761 |
| 123. | 42.9 | Lavina K-12 Schools / 385 |
| 123. | 42.9 | Roundup Elementary School District / 4,399 |
| 123. | 42.9 | Custer K-12 Schools / 411 |
| 130. | 42.7 | Birney Elementary School District / 120 |
| 131. | 42.6 | Shawmut Elementary School District / 66 |
| 132. | 42.5 | Pass Creek Elementary School District / 92 |
| 132. | 42.5 | Townsend K-12 Schools / 5,219 |
| 134. | 42.5 | Hobson K-12 Schools / 755 |
| 134. | 42.5 | King Colony Elementary School District / 309 |
| 134. | 42.5 | Judith Gap High School District / 325 |
| 134. | 42.5 | Harlowton High School District / 1,882 |
| 134. | 42.5 | Lennep Elementary School District / 107 |
| 134. | 42.5 | White Sulphur Springs Elementary School District / 1,919 |
| 134. | 42.5 | Judith Gap Elementary School District / 325 |
| 134. | 42.5 | Lewistown Elementary School District / 8,920 |
| 134. | 42.5 | Stanford K-12 Schools / 835 |
| 134. | 42.5 | White Sulphur Springs High School District / 2,026 |
| 134. | 42.5 | Moore High School District / 519 |
| 134. | 42.5 | Ringling Elementary School District / 66 |
| 134. | 42.5 | Harlowton Elementary School District / 1,816 |
| 134. | 42.5 | Fergus High School District / 9,271 |
| 134. | 42.5 | Moore Elementary School District / 519 |
| 149. | 42.4 | Hawks Home Elementary School District / 127 |
| 149. | 42.4 | Broadus Elementary School District / 1,476 |
| 151. | 42.3 | Alzada Elementary School District / 176 |
| 151. | 42.3 | Powder River County High School District / 1,728 |
| 153. | 42.2 | Ekalaka Elementary School District / 884 |
| 153. | 42.2 | Lame Deer Elementary School District / 2,765 |
| 153. | 42.2 | Winifred K-12 Schools / 424 |
| 153. | 42.2 | Roy K-12 Schools / 278 |
| 153. | 42.2 | Denton High School District / 479 |
| 153. | 42.2 | Spring Creek Colony Elementary School District / 42 |
| 153. | 42.2 | Denton Elementary School District / 469 |
| 153. | 42.2 | Deerfield Elementary School District / 10 |
| 153. | 42.2 | Landusky Elementary School District / 44 |
| 153. | 42.2 | Carter County High School District / 1,187 |
| 153. | 42.2 | Lame Deer High School District / 5,329 |
| 164. | 42.1 | Biddle Elementary School District / 101 |
| 164. | 42.1 | South Stacey Elementary School District / 47 |
| 164. | 42.1 | Darby K-12 Schools / 3,554 |
| 167. | 42.0 | Forsyth High School District / 2,680 |
| 167. | 42.0 | Spring Creek Elementary School District / 87 |
| 169. | 41.9 | Ashland Elementary School District / 1,205 |
| 169. | 41.9 | Colstrip Elementary School District / 2,445 |
| 169. | 41.9 | Colstrip High School District / 2,445 |
| 172. | 41.6 | Clancy Elementary School District / 2,935 |
| 172. | 41.6 | Jefferson High School District / 8,158 |
| 172. | 41.6 | Basin Elementary School District / 233 |
| 172. | 41.6 | Boulder Elementary School District / 2,137 |
| 172. | 41.6 | Anaconda Elementary School District / 8,970 |
| 172. | 41.6 | S H Elementary School District / 157 |
| 172. | 41.6 | Anaconda High School District / 9,046 |
| 179. | 41.5 | Custer County High School District / 11,869 |
| 179. | 41.5 | S Y Elementary School District / 75 |
| 181. | 41.5 | Rosebud High School District / 482 |
| 181. | 41.5 | Forsyth Elementary School District / 2,609 |
| 181. | 41.5 | Rosebud Elementary School District / 437 |
| 184. | 41.4 | Sand Springs Elementary School District / 148 |
| 184. | 41.4 | East Helena Elementary School District / 9,282 |
| 184. | 41.4 | Montana City Elementary School District / 2,853 |
| 187. | 40.5 | Ross Elementary School District / 68 |
| 188. | 40.4 | Trego Elementary School District / 753 |
| 188. | 40.4 | Fortine Elementary School District / 898 |
| 190. | 40.3 | Kinsey Elementary School District / 559 |
| 190. | 40.3 | Big Dry Creek Elementary School District / 57 |
| 190. | 40.3 | Garfield County High School District / 1,097 |
| 193. | 40.2 | Thompson Falls Elementary School District / 3,734 |
| 193. | 40.2 | Cohagen Elementary School District / 169 |
| 193. | 40.2 | Jordan Elementary School District / 602 |
| 193. | 40.2 | Thompson Falls High School District / 3,734 |
| 193. | 40.2 | Twin Buttes Elementary School District / 82 |
| 198. | 40.1 | Kircher Elementary School District / 797 |
| 198. | 40.1 | Miles City Elementary School District / 10,064 |
| 198. | 40.1 | Trail Creek Elementary School District / 39 |
| 198. | 40.1 | Cottonwood Elementary School District / 114 |
| 202. | 40.0 | Van Norman Elementary School District / 74 |
| 202. | 40.0 | Pine Grove Elementary School District / 66 |
| 204. | 39.8 | Wolf Point High School District / 4,735 |
| 204. | 39.8 | Culbertson High School District / 924 |
| 204. | 39.8 | Glasgow K-12 Schools / 5,202 |
| 204. | 39.8 | Richey High School District / 491 |
| 204. | 39.8 | Sidney High School District / 8,438 |
| 204. | 39.8 | Circle High School District / 1,758 |
| 204. | 39.8 | Saco High School District / 516 |
| 204. | 39.8 | Whitewater K-12 Schools / 174 |
| 204. | 39.8 | Savage High School District / 620 |
| 204. | 39.8 | Wibaux K-12 Schools / 987 |
| 204. | 39.8 | Brockton High School District / 545 |
| 204. | 39.8 | Malta K-12 Schools / 3,160 |
| 204. | 39.8 | Nashua K-12 Schools / 800 |
| 204. | 39.8 | Dawson High School District / 8,728 |
| 204. | 39.8 | St. Regis K-12 Schools / 1,333 |
| 204. | 39.8 | Vida Elementary School District / 591 |
| 204. | 39.8 | Baker K-12 Schools / 2,568 |
| 204. | 39.8 | Lambert High School District / 283 |
| 204. | 39.8 | Hinsdale High School District / 490 |
| 204. | 39.8 | Terry K-12 Schools / 1,282 |
| 204. | 39.8 | Poplar High School District / 3,661 |
| 204. | 39.8 | Frazer High School District / 719 |
| 204. | 39.8 | Fairview High School District / 1,345 |
| 204. | 39.8 | Plevna K-12 Schools / 460 |
| 204. | 39.8 | Wolf Point Elementary School District / 4,141 |
| 204. | 39.8 | Brockton Elementary School District / 545 |
| 204. | 39.8 | Culbertson Elementary School District / 1,007 |
| 204. | 39.8 | Rau Elementary School District / 391 |
| 204. | 39.8 | Deer Creek Elementary School District / 1,810 |
| 204. | 39.8 | Kester Elementary School District / 44 |
| 204. | 39.8 | Frazer Elementary School District / 498 |
| 204. | 39.8 | Fairview Elementary School District / 1,303 |
| 204. | 39.8 | Poplar Elementary School District / 3,661 |
| 204. | 39.8 | Lambert Elementary School District / 393 |
| 204. | 39.8 | Brorson Elementary School District / 116 |
| 204. | 39.8 | Glendive Elementary School District / 6,617 |
| 204. | 39.8 | Lustre Elementary School District / 221 |
| 204. | 39.8 | Bloomfield Elementary School District / 98 |
| 204. | 39.8 | Richey Elementary School District / 426 |
| 204. | 39.8 | Hinsdale Elementary School District / 461 |
| 204. | 39.8 | Lindsay Elementary School District / 291 |
| 204. | 39.8 | Savage Elementary School District / 602 |
| 204. | 39.8 | Saco Elementary School District / 545 |
| 204. | 39.8 | Sidney Elementary School District / 7,775 |
| 204. | 39.8 | Circle Elementary School District / 1,167 |
| 204. | 39.8 | Frontier Elementary School District / 594 |
| 250. | 39.7 | Dodson Elementary School District / 306 |
| 250. | 39.7 | Dodson High School District / 344 |
| 252. | 38.7 | Opheim K-12 Schools / 307 |
| 252. | 38.7 | Froid High School District / 502 |
| 252. | 38.7 | Froid Elementary School District / 502 |
| 252. | 38.7 | Peerless K-12 Schools / 148 |
| 252. | 38.7 | Scobey K-12 Schools / 1,813 |
| 252. | 38.7 | Bainville K-12 Schools / 494 |
| 258. | 38.5 | Medicine Lake K-12 Schools / 747 |
| 259. | 38.2 | Plentywood K-12 Schools / 2,464 |
| 259. | 38.2 | Westby K-12 Schools / 299 |
| 261. | 37.9 | Turner Elementary School District / 322 |
| 261. | 37.9 | Turner High School District / 307 |
| 263. | 37.6 | Stevensville Elementary School District / 7,152 |
| 263. | 37.6 | Stevensville High School District / 10,247 |
| 263. | 37.6 | Hamilton K-12 Schools / 11,592 |
| 263. | 37.6 | Corvallis K-12 Schools / 7,474 |
| 263. | 37.6 | Victor K-12 Schools / 3,538 |
| 268. | 37.5 | Philipsburg K-12 Schools / 1,644 |
| 269. | 37.5 | Alberton K-12 Schools / 1,286 |
| 270. | 37.3 | Florence-Carlton K-12 Schools / 5,211 |
| 270. | 37.3 | Lolo Elementary School District / 4,903 |
| 270. | 37.3 | Missoula Elementary School District / 70,909 |
| 270. | 37.3 | Lone Rock Elementary School District / 3,095 |
| 270. | 37.3 | Target Range Elementary School District / 3,691 |
| 270. | 37.3 | Woodman Elementary School District / 458 |
| 276. | 37.2 | Arlee High School District / 2,479 |
| 276. | 37.2 | Hall Elementary School District / 322 |
| 276. | 37.2 | Arlee Elementary School District / 2,479 |
| 276. | 37.2 | Frenchtown K-12 Schools / 6,408 |
| 280. | 37.1 | Superior K-12 Schools / 2,108 |
| 281. | 37.0 | De Smet Elementary School District / 796 |
| 281. | 37.0 | Bonner Elementary School District / 2,581 |
| 281. | 37.0 | Drummond Elementary School District / 1,167 |
| 281. | 37.0 | Seeley Lake Elementary School District / 1,571 |
| 281. | 37.0 | Hellgate Elementary School District / 13,024 |
| 281. | 37.0 | Clinton Elementary School District / 2,448 |
| 281. | 37.0 | Sunset Elementary School District / 209 |
| 281. | 37.0 | Drummond High School District / 1,489 |
| 281. | 37.0 | Potomac Elementary School District / 1,062 |
| 281. | 37.0 | Missoula High School District / 102,467 |
| 291. | 36.9 | Ovando Elementary School District / 239 |
| 292. | 36.5 | Deer Lodge Elementary School District / 5,648 |
| 293. | 36.3 | Mountain View Elementary School District / 124 |
| 293. | 36.3 | Cut Bank High School District / 4,323 |
| 293. | 36.3 | Columbia Falls Elementary School District / 14,658 |
| 293. | 36.3 | Cut Bank Elementary School District / 4,323 |
| 293. | 36.3 | Columbia Falls High School District / 15,228 |
| 293. | 36.3 | Browning Elementary School District / 8,635 |
| 293. | 36.3 | Browning High School District / 9,318 |
| 293. | 36.3 | Whitefish Elementary School District / 13,008 |
| 293. | 36.3 | East Glacier Park Elementary School District / 683 |
| 293. | 36.3 | West Glacier Elementary School District / 570 |
| 293. | 36.3 | Olney-Bissell Elementary School District / 1,184 |
| 293. | 36.3 | Whitefish High School District / 13,669 |
| 305. | 36.2 | Dixon Elementary School District / 586 |
| 305. | 36.2 | Ronan Elementary School District / 8,707 |
| 305. | 36.2 | Geyser High School District / 389 |
| 305. | 36.2 | Geyser Elementary School District / 389 |
| 305. | 36.2 | Swan Valley Elementary School District / 639 |
| 305. | 36.2 | Ronan High School District / 8,707 |
| 305. | 36.2 | Belt High School District / 1,774 |
| 305. | 36.2 | Camas Prairie Elementary School District / 172 |
| 305. | 36.2 | St. Ignatius K-12 Schools / 3,369 |
| 305. | 36.2 | Paradise Elementary School District / 389 |
| 305. | 36.2 | Charlo High School District / 1,834 |
| 305. | 36.2 | Valley View Elementary School District / 308 |
| 305. | 36.2 | Charlo Elementary School District / 1,248 |
| 305. | 36.2 | Raynesford Elementary School District / 142 |
| 305. | 36.2 | Belt Elementary School District / 1,832 |
| 320. | 36.1 | Bear Paw Elementary School District / 104 |
| 320. | 36.1 | Harlem High School District / 2,569 |
| 320. | 36.1 | Big Sandy Elementary School District / 1,336 |
| 320. | 36.1 | Cleveland Elementary School District / 123 |
| 320. | 36.1 | Hays-Lodge Pole K-12 Schools / 1,459 |
| 320. | 36.1 | Rocky Boy High School District / 2,366 |
| 320. | 36.1 | Chinook Elementary School District / 1,856 |
| 320. | 36.1 | Davey Elementary School District / 46 |
| 320. | 36.1 | Warrick Elementary School District / 44 |
| 320. | 36.1 | Geraldine High School District / 568 |
| 320. | 36.1 | Havre Elementary School District / 12,161 |
| 320. | 36.1 | Zurich Elementary School District / 281 |
| 320. | 36.1 | North Harlem Colony Elementary School District / 26 |
| 320. | 36.1 | Rocky Boy Elementary School District / 3,598 |
| 320. | 36.1 | Harlem Elementary School District / 2,405 |
| 320. | 36.1 | Chinook High School District / 2,241 |
| 320. | 36.1 | Big Sandy High School District / 2,612 |
| 320. | 36.1 | Highwood Elementary School District / 464 |
| 320. | 36.1 | Highwood High School District / 513 |
| 320. | 36.1 | Geraldine Elementary School District / 625 |
| 340. | 36.0 | Polson High School District / 11,606 |
| 340. | 36.0 | Deer Park Elementary School District / 1,119 |
| 340. | 36.0 | Pleasant Valley Elementary School District / 219 |
| 340. | 36.0 | Marion Elementary School District / 1,486 |
| 340. | 36.0 | Creston Elementary School District / 1,111 |
| 340. | 36.0 | Cayuse Prairie Elementary School District / 2,379 |
| 340. | 36.0 | Helena Flats Elementary School District / 1,780 |
| 340. | 36.0 | Heart Butte K-12 Schools / 698 |
| 340. | 36.0 | Kalispell Elementary School District / 28,320 |
| 340. | 36.0 | Hot Springs Elementary School District / 1,267 |
| 340. | 36.0 | Polson Elementary School District / 10,500 |
| 340. | 36.0 | Flathead High School District / 58,126 |
| 340. | 36.0 | Somers Elementary School District / 6,322 |
| 340. | 36.0 | Evergreen Elementary School District / 5,586 |
| 340. | 36.0 | Fair-Mont-Egan Elementary School District / 1,341 |
| 340. | 36.0 | Swan River Elementary School District / 1,489 |
| 340. | 36.0 | Sunburst K-12 Schools / 1,115 |
| 340. | 36.0 | Smith Valley Elementary School District / 1,883 |
| 340. | 36.0 | Hot Springs High School District / 1,471 |
| 340. | 36.0 | Whitlash Elementary School District / 35 |
| 340. | 36.0 | West Valley Elementary School District / 3,967 |
| 361. | 35.9 | Plains High School District / 3,177 |
| 361. | 35.9 | Plains Elementary School District / 2,788 |
| 361. | 35.9 | Swan Lake-Salmon Elementary School District / 387 |
| 364. | 35.8 | Trinity Elementary School District / 1,733 |
| 364. | 35.8 | Garrison Elementary School District / 93 |
| 364. | 35.8 | Helmville Elementary School District / 299 |
| 364. | 35.8 | Avon Elementary School District / 237 |
| 364. | 35.8 | Helena Elementary School District / 51,357 |
| 364. | 35.8 | Wolf Creek Elementary School District / 581 |
| 364. | 35.8 | Elliston Elementary School District / 484 |
| 364. | 35.8 | Powell County High School District / 7,207 |
| 364. | 35.8 | Lincoln K-12 Schools / 1,130 |
| 364. | 35.8 | Helena High School District / 62,953 |
| 364. | 35.8 | Gold Creek Elementary School District / 207 |
| 375. | 35.7 | Augusta High School District / 689 |
| 375. | 35.7 | Great Falls Elementary School District / 72,487 |
| 375. | 35.7 | Augusta Elementary School District / 685 |
| 375. | 35.7 | Auchard Creek Elementary School District / 4 |
| 375. | 35.7 | Cascade High School District / 2,639 |
| 375. | 35.7 | Sun River Valley Elementary School District / 2,296 |
| 375. | 35.7 | Ulm Elementary School District / 637 |
| 375. | 35.7 | Cascade Elementary School District / 1,907 |
| 375. | 35.7 | Simms High School District / 3,330 |
| 375. | 35.7 | Centerville High School District / 1,615 |
| 375. | 35.7 | Golden Ridge Elementary School District / 139 |
| 375. | 35.7 | Centerville Elementary School District / 1,665 |
| 375. | 35.7 | Great Falls High School District / 72,595 |
| 375. | 35.7 | Deep Creek Elementary School District / 95 |
| 389. | 35.6 | Miami Elementary School District / 232 |
| 389. | 35.6 | Dupuyer Elementary School District / 188 |
| 389. | 35.6 | Power High School District / 624 |
| 389. | 35.6 | Valier Elementary School District / 1,022 |
| 389. | 35.6 | Power Elementary School District / 608 |
| 389. | 35.6 | Chester-Joplin-Inverness Elementary School District / 2,185 |
| 389. | 35.6 | North Star Elementary School District / 811 |
| 389. | 35.6 | Fairfield Elementary School District / 1,270 |
| 389. | 35.6 | Havre High School District / 12,531 |
| 389. | 35.6 | Liberty Elementary School District / 171 |
| 389. | 35.6 | Fort Benton Elementary School District / 1,728 |
| 389. | 35.6 | Shelby Elementary School District / 3,793 |
| 389. | 35.6 | Galata Elementary School District / 300 |
| 389. | 35.6 | Benton Lake Elementary School District / 95 |
| 389. | 35.6 | Gildford Colony Elementary School District / 107 |
| 389. | 35.6 | Carter Elementary School District / 208 |
| 389. | 35.6 | Vaughn Elementary School District / 1,034 |
| 389. | 35.6 | Kila Elementary School District / 2,090 |
| 389. | 35.6 | Dutton/Brady K-12 Schools / 1,068 |
| 389. | 35.6 | Conrad Elementary School District / 3,568 |
| 389. | 35.6 | Fairfield High School District / 1,965 |
| 389. | 35.6 | Choteau High School District / 2,921 |
| 389. | 35.6 | Cottonwood Elementary School District / 347 |
| 389. | 35.6 | Valier High School District / 1,210 |
| 389. | 35.6 | Choteau Elementary School District / 2,399 |
| 389. | 35.6 | Knees Elementary School District / 135 |
| 389. | 35.6 | Upper West Shore Elementary School District / 798 |
| 389. | 35.6 | Shelby High School District / 4,093 |
| 389. | 35.6 | Bigfork Elementary School District / 5,893 |
| 389. | 35.6 | Pendroy Elementary School District / 221 |
| 389. | 35.6 | North Star High School District / 941 |
| 389. | 35.6 | Chester-Joplin-Inverness High School District / 2,391 |
| 389. | 35.6 | Box Elder Elementary School District / 440 |
| 389. | 35.6 | Greenfield Elementary School District / 572 |
| 389. | 35.6 | Fort Benton High School District / 2,166 |
| 389. | 35.6 | Bigfork High School District / 7,593 |
| 389. | 35.6 | Box Elder High School District / 440 |
| 389. | 35.6 | Bynum Elementary School District / 301 |
| 389. | 35.6 | Conrad High School District / 3,800 |
Please note that we only rank locations with 'Air Quality Index' data. The rank above might not be a complete list. Locations without 'Air Quality Index' data are not listed.
