| Rank | Air Quality Index ▼ | School District / Population |
| 1. | 49.9 | Easton School District / 7,593 |
| 1. | 49.9 | Norwalk School District / 87,214 |
| 1. | 49.9 | Westport School District / 27,055 |
| 1. | 49.9 | New Canaan School District / 20,073 |
| 1. | 49.9 | Fairfield School District / 60,678 |
| 6. | 49.8 | Darien School District / 21,190 |
| 6. | 49.8 | Stamford School District / 125,401 |
| 6. | 49.8 | Trumbull School District / 36,444 |
| 6. | 49.8 | Stratford School District / 52,092 |
| 6. | 49.8 | Bridgeport School District / 146,680 |
| 11. | 49.6 | Essex School District / 6,643 |
| 12. | 49.3 | Old Saybrook School District / 10,222 |
| 13. | 49.2 | Westbrook School District / 6,916 |
| 13. | 49.2 | Regional High School District 04 / 15,477 |
| 13. | 49.2 | Deep River School District / 4,611 |
| 13. | 49.2 | Chester School District / 4,223 |
| 13. | 49.2 | Clinton School District / 13,188 |
| 18. | 48.5 | Regional School District 17 / 14,872 |
| 19. | 47.9 | Weston School District / 10,319 |
| 19. | 47.9 | Wilton School District / 18,519 |
| 21. | 47.7 | Guilford School District / 22,405 |
| 21. | 47.7 | Regional School District 18 / 9,954 |
| 21. | 47.7 | Madison School District / 18,284 |
| 24. | 47.3 | East Haven School District / 29,139 |
| 24. | 47.3 | West Haven School District / 55,290 |
| 24. | 47.3 | Branford School District / 28,066 |
| 24. | 47.3 | East Haddam School District / 9,142 |
| 28. | 47.0 | North Branford School District / 14,387 |
| 28. | 47.0 | Monroe School District / 19,744 |
| 30. | 46.9 | Litchfield School District / 8,365 |
| 30. | 46.9 | Regional School District 14 / 13,402 |
| 32. | 46.7 | Ridgefield School District / 25,025 |
| 32. | 46.7 | Regional High School District 09 / 16,860 |
| 32. | 46.7 | Newtown School District / 27,960 |
| 32. | 46.7 | Redding School District / 9,267 |
| 36. | 46.6 | Watertown School District / 22,286 |
| 37. | 46.5 | Lebanon School District / 7,314 |
| 38. | 46.5 | Waterford School District / 19,499 |
| 38. | 46.5 | New London School District / 27,536 |
| 38. | 46.5 | East Lyme School District / 19,118 |
| 38. | 46.5 | Regional School District 12 / 7,549 |
| 42. | 46.4 | Union School District / 950 |
| 43. | 46.0 | Milford School District / 53,039 |
| 44. | 45.9 | Stafford School District / 12,013 |
| 44. | 45.9 | Shelton School District / 40,472 |
| 46. | 45.8 | New Haven School District / 130,553 |
| 46. | 45.8 | Orange School District / 13,947 |
| 48. | 45.7 | Salem School District / 4,176 |
| 48. | 45.7 | Bozrah School District / 2,631 |
| 50. | 45.6 | Thomaston School District / 7,793 |
| 51. | 45.5 | Plymouth School District / 12,085 |
| 51. | 45.5 | Regional School District 10 / 15,035 |
| 51. | 45.5 | Somers School District / 11,431 |
| 51. | 45.5 | Torrington School District / 35,774 |
| 55. | 45.4 | Eastford School District / 1,726 |
| 55. | 45.4 | Greenwich School District / 62,141 |
| 57. | 45.3 | Wolcott School District / 16,724 |
| 57. | 45.3 | Southington School District / 43,509 |
| 59. | 45.2 | New Hartford School District / 6,910 |
| 59. | 45.2 | Regional School District 13 / 11,797 |
| 61. | 45.1 | Ansonia School District / 19,128 |
| 61. | 45.1 | Bethany School District / 5,546 |
| 61. | 45.1 | Seymour School District / 16,551 |
| 61. | 45.1 | Woodbridge School District / 8,969 |
| 61. | 45.1 | Derby School District / 12,837 |
| 61. | 45.1 | Hamden School District / 61,605 |
| 61. | 45.1 | Colchester School District / 16,143 |
| 61. | 45.1 | Regional High School District 05 / 28,462 |
| 61. | 45.1 | Colebrook School District / 1,594 |
| 70. | 45.0 | Meriden School District / 60,616 |
| 70. | 45.0 | North Haven School District / 23,997 |
| 70. | 45.0 | Wallingford School District / 45,154 |
| 73. | 44.9 | Regional School District 15 / 27,451 |
| 73. | 44.9 | Ledyard School District / 15,090 |
| 73. | 44.9 | New Fairfield School District / 14,079 |
| 73. | 44.9 | Plainfield School District / 15,270 |
| 73. | 44.9 | Montville School District / 19,649 |
| 73. | 44.9 | New Milford School District / 27,821 |
| 73. | 44.9 | Griswold School District / 11,952 |
| 73. | 44.9 | Norwich School District / 40,378 |
| 73. | 44.9 | Preston School District / 4,735 |
| 73. | 44.9 | North Stonington School District / 5,293 |
| 73. | 44.9 | Groton School District / 40,136 |
| 73. | 44.9 | Lisbon School District / 4,340 |
| 73. | 44.9 | Woodstock School District / 7,916 |
| 73. | 44.9 | Sprague School District / 2,993 |
| 73. | 44.9 | Chaplin School District / 2,256 |
| 73. | 44.9 | Canterbury School District / 5,110 |
| 73. | 44.9 | Regional High School District 11 / 5,877 |
| 73. | 44.9 | Brookfield School District / 16,774 |
| 73. | 44.9 | Stonington School District / 18,539 |
| 73. | 44.9 | Franklin School District / 1,993 |
| 93. | 44.8 | Scotland School District / 1,709 |
| 93. | 44.8 | Pomfret School District / 4,216 |
| 93. | 44.8 | Hampton School District / 1,912 |
| 93. | 44.8 | Brooklyn School District / 8,240 |
| 97. | 44.7 | Voluntown School District / 2,602 |
| 97. | 44.7 | Sharon School District / 2,746 |
| 97. | 44.7 | Cornwall School District / 1,505 |
| 97. | 44.7 | Willington School District / 5,994 |
| 97. | 44.7 | Suffield School District / 15,764 |
| 97. | 44.7 | Danbury School District / 82,781 |
| 97. | 44.7 | Bethel School District / 19,078 |
| 97. | 44.7 | Tolland School District / 14,971 |
| 97. | 44.7 | Regional High School District 01 / 15,412 |
| 97. | 44.7 | Canaan School District / 1,240 |
| 97. | 44.7 | Regional School District 06 / 6,635 |
| 108. | 44.6 | Windham School District / 25,271 |
| 108. | 44.6 | Oxford School District / 12,831 |
| 108. | 44.6 | Ashford School District / 4,297 |
| 108. | 44.6 | Mansfield School District / 26,328 |
| 108. | 44.6 | Ellington School District / 15,725 |
| 108. | 44.6 | Coventry School District / 12,434 |
| 108. | 44.6 | Regional High School District 19 / 36,619 |
| 108. | 44.6 | Naugatuck School District / 31,790 |
| 108. | 44.6 | Sherman School District / 3,636 |
| 108. | 44.6 | North Canaan School District / 3,262 |
| 118. | 44.5 | Waterbury School District / 109,887 |
| 118. | 44.5 | Regional School District 16 / 15,680 |
| 118. | 44.5 | Hebron School District / 9,627 |
| 118. | 44.5 | Rocky Hill School District / 19,838 |
| 118. | 44.5 | Cheshire School District / 29,272 |
| 118. | 44.5 | East Hampton School District / 12,936 |
| 118. | 44.5 | Cromwell School District / 14,077 |
| 118. | 44.5 | Berlin School District / 20,352 |
| 118. | 44.5 | Norfolk School District / 1,486 |
| 118. | 44.5 | Marlborough School District / 6,428 |
| 118. | 44.5 | Middletown School District / 47,424 |
| 118. | 44.5 | Regional High School District 08 / 19,236 |
| 118. | 44.5 | Portland School District / 9,483 |
| 131. | 44.5 | Barkhamsted School District / 3,749 |
| 131. | 44.5 | Regional High School District 07 / 13,739 |
| 131. | 44.5 | Winchester School District / 11,089 |
| 134. | 44.4 | Plainville School District / 17,791 |
| 134. | 44.4 | Bristol School District / 60,556 |
| 136. | 44.3 | Salisbury School District / 3,708 |
| 136. | 44.3 | Thompson School District / 9,390 |
| 136. | 44.3 | Kent School District / 2,951 |
| 139. | 44.1 | South Windsor School District / 25,795 |
| 139. | 44.1 | Manchester School District / 58,270 |
| 139. | 44.1 | Columbia School District / 5,472 |
| 139. | 44.1 | Andover School District / 3,181 |
| 139. | 44.1 | Vernon School District / 29,162 |
| 139. | 44.1 | Bolton School District / 4,963 |
| 139. | 44.1 | East Windsor School District / 11,353 |
| 146. | 44.0 | West Hartford School District / 63,396 |
| 146. | 44.0 | Putnam School District / 9,515 |
| 146. | 44.0 | Wethersfield School District / 26,579 |
| 146. | 44.0 | Glastonbury School District / 34,661 |
| 146. | 44.0 | New Britain School District / 73,095 |
| 146. | 44.0 | East Hartford School District / 51,211 |
| 146. | 44.0 | Avon School District / 18,298 |
| 146. | 44.0 | Farmington School District / 25,515 |
| 146. | 44.0 | Newington School District / 30,652 |
| 146. | 44.0 | Hartford School District / 125,211 |
| 156. | 43.8 | Hartland School District / 2,211 |
| 156. | 43.8 | Enfield School District / 44,713 |
| 158. | 43.7 | Granby School District / 11,310 |
| 159. | 43.6 | Canton School District / 10,334 |
| 160. | 43.3 | Sterling School District / 3,809 |
| 161. | 43.1 | Simsbury School District / 23,681 |
| 161. | 43.1 | Bloomfield School District / 20,626 |
| 161. | 43.1 | Windsor School District / 29,130 |
| 161. | 43.1 | Windsor Locks School District / 12,554 |
| 161. | 43.1 | Killingly School District / 17,281 |
| 166. | 42.9 | East Granby School District / 5,098 |
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.
