| Rank | Air Quality Index ▼ | School District / Population |
| 1. | 52.5 | Elizabeth School District C-1 / 14,949 |
| 1. | 52.5 | Douglas County School District RE-1 / 302,027 |
| 1. | 52.5 | Littleton School District 6 / 96,044 |
| 4. | 52.4 | Roaring Fork School District RE-1 / 38,129 |
| 5. | 52.1 | Garfield County School District 16 / 6,409 |
| 6. | 51.3 | Eagle County School District RE 50 / 43,984 |
| 6. | 51.3 | Clear Creek School District RE-1 / 9,114 |
| 8. | 50.8 | Rangely School District RE-4 / 3,102 |
| 9. | 50.7 | Gilpin County School District RE-1 / 2,928 |
| 9. | 50.7 | Garfield School District RE-2 / 24,414 |
| 11. | 50.5 | North Park School District R-1 / 1,389 |
| 11. | 50.5 | Park School District R-3 / 11,437 |
| 13. | 50.3 | East Grand School District 2 / 11,465 |
| 13. | 50.3 | Plateau Valley School District 50 / 2,507 |
| 13. | 50.3 | West Grand School District 1-JT / 3,216 |
| 16. | 50.0 | South Routt School District RE-3 / 2,975 |
| 16. | 50.0 | Delta County School District 50J / 31,037 |
| 16. | 50.0 | West End School District RE-2 / 1,763 |
| 19. | 49.8 | Mesa County Valley School District 51 / 144,366 |
| 20. | 49.5 | De Beque School District 49-JT / 713 |
| 21. | 49.4 | St. Vrain Valley School District RE 1J / 158,582 |
| 22. | 49.2 | Steamboat Springs School District RE-2 / 17,654 |
| 23. | 49.0 | Meeker School District RE1 / 3,637 |
| 23. | 49.0 | Boulder Valley School District RE-2 / 220,354 |
| 25. | 48.8 | Summit School District RE-1 / 28,389 |
| 26. | 48.7 | Jefferson County School District R-1 / 549,339 |
| 27. | 48.4 | Park County School District RE-2 / 6,648 |
| 27. | 48.4 | Buena Vista School District R-31 / 8,275 |
| 29. | 48.3 | Genoa-Hugo School District C-113 / 1,210 |
| 29. | 48.3 | Stratton School District R-4 / 1,066 |
| 31. | 48.2 | La Veta School District RE-2 / 1,415 |
| 31. | 48.2 | Miami-Yoder School District 60-JT / 1,661 |
| 31. | 48.2 | Karval School District RE-23 / 292 |
| 31. | 48.2 | Kim Reorganized School District 88 / 355 |
| 31. | 48.2 | Kit Carson School District R-1 / 561 |
| 31. | 48.2 | Ellicott School District 22 / 4,184 |
| 31. | 48.2 | Las Animas School District RE-1 / 5,149 |
| 31. | 48.2 | East Otero School District R-1 / 8,472 |
| 31. | 48.2 | Elbert School District 200 / 1,393 |
| 31. | 48.2 | Edison School District 54-JT / 268 |
| 31. | 48.2 | Kiowa School District C-2 / 2,634 |
| 31. | 48.2 | Moffat Consolidated School District 2 / 1,526 |
| 31. | 48.2 | Hanover School District 28 / 2,125 |
| 31. | 48.2 | Harrison School District 2 / 73,557 |
| 31. | 48.2 | McClave School District RE-2 / 706 |
| 31. | 48.2 | Hoehne Reorganized School District 3 / 2,079 |
| 31. | 48.2 | Fowler School District R-4J / 1,948 |
| 31. | 48.2 | Fountain School District 8 / 33,325 |
| 31. | 48.2 | Lewis-Palmer School District 38 / 29,871 |
| 31. | 48.2 | Manzanola School District 3J / 893 |
| 31. | 48.2 | Florence School District RE-2 / 17,516 |
| 31. | 48.2 | Manitou Springs School District 14 / 8,345 |
| 31. | 48.2 | Falcon School District 49 / 79,075 |
| 31. | 48.2 | Eads School District RE-1 / 1,114 |
| 31. | 48.2 | Peyton School District 23-JT / 4,130 |
| 31. | 48.2 | Rocky Ford School District R-2 / 5,908 |
| 31. | 48.2 | Cheraw School District 31 / 595 |
| 31. | 48.2 | Woodland Park School District RE-2 / 18,197 |
| 31. | 48.2 | Canon City School District RE-1 / 27,013 |
| 31. | 48.2 | Trinidad School District 1 / 9,842 |
| 31. | 48.2 | Swink School District 33 / 1,508 |
| 31. | 48.2 | Calhan School District RJ-1 / 2,958 |
| 31. | 48.2 | Salida School District R-32 / 9,919 |
| 31. | 48.2 | Crowley County School District RE-1-J / 5,266 |
| 31. | 48.2 | Widefield School District 3 / 48,360 |
| 31. | 48.2 | Branson Reorganized School District 82 / 148 |
| 31. | 48.2 | Aguilar Reorganized School District 6 / 1,187 |
| 31. | 48.2 | Cheyenne Mountain School District 12 / 22,131 |
| 31. | 48.2 | Wiley School District RE-13-JT / 925 |
| 31. | 48.2 | Academy School District 20 / 99,520 |
| 31. | 48.2 | Pritchett School District RE-3 / 237 |
| 31. | 48.2 | Pueblo City School District 60 / 110,267 |
| 31. | 48.2 | Big Sandy School District 100J / 1,679 |
| 31. | 48.2 | Pueblo County School District 70 / 50,228 |
| 31. | 48.2 | Cripple Creek-Victor School District RE-1 / 5,166 |
| 31. | 48.2 | Cotopaxi School District RE-3 / 3,025 |
| 31. | 48.2 | Custer County School District C-1 / 3,825 |
| 31. | 48.2 | Colorado Springs School District 11 / 235,794 |
| 31. | 48.2 | Huerfano School District RE-1 / 5,135 |
| 80. | 48.1 | Bethune School District R-5 / 594 |
| 80. | 48.1 | Limon School District RE-4J / 3,576 |
| 80. | 48.1 | Arriba-Flagler School District C-20 / 1,080 |
| 80. | 48.1 | Hi-Plains School District R-23 / 485 |
| 80. | 48.1 | Moffat County School District RE-1 / 13,286 |
| 85. | 47.9 | Poudre School District R-1 / 191,740 |
| 86. | 47.8 | Sangre de Cristo School District RE-22J / 1,332 |
| 86. | 47.8 | Montrose County School District RE-1J / 38,523 |
| 88. | 47.6 | Hayden School District RE-1 / 2,688 |
| 89. | 47.5 | Sierra Grande School District R-30 / 1,988 |
| 89. | 47.5 | Mountain Valley School District RE-1 / 1,614 |
| 89. | 47.5 | Lake County School District R-1 / 7,311 |
| 89. | 47.5 | Mancos School District RE-6 / 3,300 |
| 89. | 47.5 | Platte Canyon School District 1 / 9,526 |
| 94. | 47.5 | Montezuma-Cortez School District RE-1 / 18,638 |
| 94. | 47.5 | Dolores School District RE-4A / 3,631 |
| 94. | 47.5 | Dolores County School District RE-2 / 1,898 |
| 94. | 47.5 | Norwood School District R-2J / 2,034 |
| 98. | 47.4 | Keenesburg School District RE-3J / 13,595 |
| 99. | 47.1 | Aspen School District 1 / 13,208 |
| 99. | 47.1 | Northglenn-Thornton School District 12 / 218,955 |
| 99. | 47.1 | Westminster School District 50 / 73,584 |
| 102. | 46.8 | Springfield School District RE-4 / 1,907 |
| 102. | 46.8 | Lamar School District RE-2 / 9,183 |
| 102. | 46.8 | Vilas School District RE-5 / 342 |
| 102. | 46.8 | Campo School District RE-6 / 179 |
| 106. | 46.6 | Johnstown-Milliken School District RE-5J / 17,883 |
| 106. | 46.6 | Weld County School District RE-1 / 9,691 |
| 108. | 46.5 | Otis School District R-3 / 796 |
| 108. | 46.5 | Wiggins School District RE-50J / 2,637 |
| 108. | 46.5 | Lone Star School District 101 / 220 |
| 108. | 46.5 | Idalia School District RJ-3 / 542 |
| 108. | 46.5 | Brush School District RE-2J / 7,844 |
| 108. | 46.5 | Liberty School District J-4 / 600 |
| 108. | 46.5 | Wray School District RD-2 / 3,991 |
| 108. | 46.5 | Akron School District R-1 / 2,653 |
| 108. | 46.5 | Weld County School District RE-8 / 12,355 |
| 108. | 46.5 | Fort Morgan School District RE-3 / 17,284 |
| 108. | 46.5 | Arickaree School District R-2 / 516 |
| 108. | 46.5 | Yuma School District 1 / 4,874 |
| 120. | 46.5 | Greeley School District 6 / 119,134 |
| 120. | 46.5 | Windsor School District RE-4 / 22,539 |
| 120. | 46.5 | Deer Trail School District 26J / 666 |
| 120. | 46.5 | Primero Reorganized School District 2 / 1,178 |
| 124. | 46.4 | Cherry Creek School District 5 / 286,782 |
| 124. | 46.4 | Englewood School District 1 / 25,598 |
| 124. | 46.4 | Gunnison Watershed School District RE-1J / 15,435 |
| 127. | 46.2 | Woodlin School District R-104 / 506 |
| 128. | 46.0 | Buffalo School District RE-4 / 803 |
| 128. | 46.0 | Platte Valley School District RE-3 / 809 |
| 128. | 46.0 | Julesburg School District RE-1 / 1,547 |
| 128. | 46.0 | Frenchman School District RE-3 / 1,058 |
| 128. | 46.0 | Holyoke School District RE-1J / 3,182 |
| 128. | 46.0 | Haxtun School District RE-2J / 1,373 |
| 128. | 46.0 | Thompson School District R-2J / 109,215 |
| 135. | 45.9 | Cheyenne County School District RE-5 / 1,592 |
| 136. | 45.8 | Sheridan School District 2 / 8,548 |
| 136. | 45.8 | Weldon Valley School District RE-20J / 732 |
| 138. | 45.7 | Alamosa School District RE-11J / 14,931 |
| 138. | 45.7 | Agate School District 300 / 748 |
| 138. | 45.7 | Center School District 26-JT / 2,964 |
| 141. | 45.6 | Valley School District RE-1 / 20,236 |
| 141. | 45.6 | Prairie School District RE-11 / 470 |
| 141. | 45.6 | Briggsdale School District RE-10 / 553 |
| 141. | 45.6 | Platte Valley School District RE-7 / 4,947 |
| 141. | 45.6 | Plateau School District RE-5 / 546 |
| 141. | 45.6 | Ault-Highland School District RE-9 / 5,615 |
| 141. | 45.6 | Pawnee School District RE-12 / 536 |
| 141. | 45.6 | Eaton School District RE-2 / 9,568 |
| 149. | 45.3 | Strasburg School District 31J / 5,119 |
| 149. | 45.3 | Ridgway School District R-2 / 2,395 |
| 149. | 45.3 | Bennett School District 29-J / 5,758 |
| 152. | 44.9 | Telluride School District R-1 / 5,964 |
| 153. | 44.8 | Sanford School District 6J / 1,344 |
| 153. | 44.8 | Archuleta County School District 50-JT / 11,596 |
| 153. | 44.8 | South Conejos School District RE-10 / 2,179 |
| 153. | 44.8 | North Conejos School District RE-1J / 4,771 |
| 153. | 44.8 | Monte Vista School District C-8 / 6,183 |
| 153. | 44.8 | Sargent School District RE-33J / 1,052 |
| 159. | 44.7 | Centennial School District R-1 / 1,590 |
| 159. | 44.7 | Ouray School District R-1 / 1,718 |
| 159. | 44.7 | Del Norte School District C-7 / 4,406 |
| 159. | 44.7 | Hinsdale County School District RE-1 / 812 |
| 159. | 44.7 | Silverton School District 1 / 653 |
| 159. | 44.7 | Bayfield School District R-10-JT / 8,145 |
| 159. | 44.7 | Creede Consolidated School District 1 / 704 |
| 166. | 44.5 | Adams County School District 14 / 38,448 |
| 166. | 44.5 | Mapleton School District 1 / 31,238 |
| 166. | 44.5 | Brighton School District 27J / 81,937 |
| 166. | 44.5 | Byers School District 32J / 2,695 |
| 170. | 44.1 | Ignacio School District 11-JT / 6,023 |
| 171. | 43.9 | Durango School District 9-R / 38,974 |
| 172. | 43.5 | Adams-Arapahoe School District 28J / 214,656 |
| 173. | 43.0 | Plainview School District RE-2 / 293 |
| 173. | 43.0 | Granada School District RE-1 / 1,026 |
| 173. | 43.0 | Holly School District RE-3 / 1,370 |
| 176. | 42.9 | Burlington School District RE-6J / 5,241 |
| 177. | 42.6 | Denver County School District 1 / 633,777 |
| 178. | 42.5 | Walsh School District RE-1 / 1,070 |
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.
