| Rank | Air Quality Index ▼ | School District / Population |
| 1. | 40.8 | Mount Desert / 2,174 |
| 2. | 40.5 | Bar Harbor / 5,269 |
| 2. | 40.5 | Trenton / 1,555 |
| 2. | 40.5 | Regional School Unit 24 / 18,942 |
| 2. | 40.5 | Mount Desert Community School District / 11,183 |
| 6. | 40.4 | Cranberry Isles / 123 |
| 6. | 40.4 | School Administrative District 76 / 302 |
| 6. | 40.4 | Frenchboro / 79 |
| 6. | 40.4 | Southwest Harbor / 1,976 |
| 6. | 40.4 | Tremont / 1,764 |
| 11. | 40.3 | Biddeford / 21,303 |
| 11. | 40.3 | Regional School Unit 23 / 29,425 |
| 13. | 40.0 | Kittery / 9,573 |
| 14. | 39.7 | York / 12,661 |
| 15. | 39.6 | Wells-Ogunquit Community School District / 10,924 |
| 16. | 39.5 | School Administrative District 35 / 13,510 |
| 17. | 39.1 | Sanford / 20,853 |
| 18. | 38.7 | Regional School Unit 21 / 18,582 |
| 18. | 38.7 | Cape Elizabeth / 9,093 |
| 20. | 38.6 | School Administrative District 60 / 18,087 |
| 20. | 38.6 | Brunswick / 20,329 |
| 22. | 38.5 | School Administrative District 57 / 22,234 |
| 22. | 38.5 | Regional School Unit 05 / 13,441 |
| 22. | 38.5 | Southport / 622 |
| 22. | 38.5 | Georgetown / 1,050 |
| 26. | 38.4 | School Administrative District 37 / 4,633 |
| 26. | 38.4 | Beals / 485 |
| 26. | 38.4 | Deblois / 44 |
| 26. | 38.4 | Falmouth / 11,424 |
| 26. | 38.4 | Monhegan Plantation / 39 |
| 26. | 38.4 | Chebeague Island / 431 |
| 26. | 38.4 | School Administrative District 51 / 10,963 |
| 26. | 38.4 | Long Island / 239 |
| 26. | 38.4 | Yarmouth / 8,433 |
| 26. | 38.4 | Jonesport / 1,239 |
| 36. | 38.3 | Bristol / 2,738 |
| 36. | 38.3 | South Portland / 25,154 |
| 36. | 38.3 | Bremen / 894 |
| 36. | 38.3 | Portland / 66,317 |
| 36. | 38.3 | Boothbay-Boothbay Harbor Community School District / 5,113 |
| 36. | 38.3 | South Bristol / 952 |
| 36. | 38.3 | Louds Island Unorganized Territory |
| 36. | 38.3 | Acton / 2,497 |
| 36. | 38.3 | Scarborough / 19,209 |
| 36. | 38.3 | Westbrook / 17,662 |
| 46. | 38.2 | Great Salt Bay Community School District / 4,670 |
| 46. | 38.2 | Damariscotta / 2,001 |
| 46. | 38.2 | Newcastle / 1,775 |
| 46. | 38.2 | Isle au Haut / 61 |
| 50. | 38.1 | Brooklin / 858 |
| 50. | 38.1 | Regional School Unit 12 / 14,756 |
| 50. | 38.1 | Jefferson / 2,535 |
| 53. | 38.0 | Deer Isle-Stonington Community School District / 3,165 |
| 53. | 38.0 | Regional School Unit 01 / 15,974 |
| 53. | 38.0 | Surry / 1,666 |
| 53. | 38.0 | Sedgwick / 1,137 |
| 53. | 38.0 | Blue Hill / 2,680 |
| 53. | 38.0 | Brooksville / 885 |
| 59. | 37.9 | Edgecomb / 1,154 |
| 59. | 37.9 | Vassalboro / 4,337 |
| 59. | 37.9 | School Administrative District 40 / 14,356 |
| 59. | 37.9 | Sagadahoc Unorganized Territory |
| 59. | 37.9 | Lincoln Unorganized Territory / 1 |
| 59. | 37.9 | Nobleboro / 1,702 |
| 59. | 37.9 | Regional School Unit 18 / 19,051 |
| 59. | 37.9 | School Administrative District 75 / 19,467 |
| 67. | 37.8 | Regional School Unit 02 / 14,616 |
| 67. | 37.8 | School Administrative District 11 / 13,654 |
| 67. | 37.8 | Winthrop / 6,046 |
| 67. | 37.8 | Auburn / 22,960 |
| 67. | 37.8 | Augusta / 18,898 |
| 72. | 37.7 | Lewiston / 36,410 |
| 72. | 37.7 | Lisbon / 8,936 |
| 72. | 37.7 | Knox Unorganized Territory / 1 |
| 75. | 37.6 | School Administrative District 08 / 1,327 |
| 75. | 37.6 | School Administrative District 65 / 58 |
| 77. | 37.5 | Regional School Unit 04 / 10,540 |
| 77. | 37.5 | Regional School Unit 14 / 21,760 |
| 77. | 37.5 | Gorham / 16,677 |
| 80. | 37.4 | Winslow / 7,709 |
| 80. | 37.4 | School Administrative District 06 / 26,158 |
| 82. | 37.3 | School Administrative District 15 / 13,450 |
| 82. | 37.3 | Jonesboro / 495 |
| 84. | 37.2 | School Administrative District 28 / 8,177 |
| 84. | 37.2 | Regional School Unit 13 / 17,174 |
| 84. | 37.2 | School Administrative District 07 / 410 |
| 84. | 37.2 | Hope / 1,651 |
| 88. | 37.1 | East Machias / 1,381 |
| 88. | 37.1 | School Administrative District 19 / 1,485 |
| 88. | 37.1 | Cooper / 133 |
| 88. | 37.1 | Marshfield / 462 |
| 88. | 37.1 | Meddybemps / 121 |
| 88. | 37.1 | Robbinston / 533 |
| 88. | 37.1 | Dennysville / 324 |
| 88. | 37.1 | Charlotte / 279 |
| 88. | 37.1 | Whitneyville / 173 |
| 88. | 37.1 | Crawford / 94 |
| 88. | 37.1 | Baring Plantation / 265 |
| 88. | 37.1 | Northfield / 174 |
| 88. | 37.1 | Eastport / 1,414 |
| 88. | 37.1 | Wesley / 77 |
| 88. | 37.1 | Calais / 3,063 |
| 88. | 37.1 | Cutler / 468 |
| 88. | 37.1 | Pembroke / 881 |
| 88. | 37.1 | Pleasant Point / 787 |
| 88. | 37.1 | Machiasport / 1,185 |
| 88. | 37.1 | Whiting / 467 |
| 88. | 37.1 | Perry / 825 |
| 88. | 37.1 | Alexander / 437 |
| 88. | 37.1 | Machias / 2,209 |
| 88. | 37.1 | Roque Bluffs / 262 |
| 112. | 36.9 | Appleton / 1,474 |
| 112. | 36.9 | Lincolnville / 2,269 |
| 112. | 36.9 | Waterville / 15,886 |
| 112. | 36.9 | Otis / 587 |
| 116. | 36.8 | School Administrative District 49 / 14,602 |
| 116. | 36.8 | Airline Community School District / 464 |
| 116. | 36.8 | Regional School Unit 38 / 7,860 |
| 116. | 36.8 | Hancock Unorganized Territory / 177 |
| 116. | 36.8 | School Administrative District 74 / 5,395 |
| 116. | 36.8 | School Administrative District 55 / 8,125 |
| 122. | 36.7 | Kennebec Unorganized Territory / 41 |
| 122. | 36.7 | Regional School Unit 25 / 8,333 |
| 124. | 36.6 | Beddington / 40 |
| 124. | 36.6 | School Administrative District 54 / 17,008 |
| 124. | 36.6 | Islesboro / 643 |
| 127. | 36.5 | School Administrative District 59 / 5,326 |
| 128. | 36.5 | School Administrative District 63 / 6,385 |
| 128. | 36.5 | Orrington / 3,721 |
| 128. | 36.5 | Dedham / 1,584 |
| 131. | 36.3 | Bangor / 32,800 |
| 131. | 36.3 | Penobscot / 1,153 |
| 131. | 36.3 | School Administrative District 22 / 13,773 |
| 131. | 36.3 | Hermon / 5,598 |
| 131. | 36.3 | Brewer / 9,391 |
| 131. | 36.3 | Regional School Unit 20 / 17,022 |
| 131. | 36.3 | School Administrative District 03 / 10,597 |
| 131. | 36.3 | School Administrative District 23 / 5,696 |
| 131. | 36.3 | School Administrative District 13 / 1,570 |
| 131. | 36.3 | Castine / 1,425 |
| 141. | 36.2 | School Administrative District 36 / 5,282 |
| 141. | 36.2 | Greenbush / 1,441 |
| 141. | 36.2 | Washington Unorganized Territory / 1,495 |
| 141. | 36.2 | Baileyville / 1,409 |
| 141. | 36.2 | Regional School Unit 34 / 10,069 |
| 141. | 36.2 | Milford / 3,054 |
| 141. | 36.2 | Regional School Unit 26 / 10,515 |
| 141. | 36.2 | Fayette / 1,143 |
| 141. | 36.2 | School Administrative District 53 / 6,297 |
| 141. | 36.2 | School Administrative District 52 / 12,096 |
| 151. | 36.1 | Caratunk / 107 |
| 151. | 36.1 | Greenville / 1,841 |
| 151. | 36.1 | The Forks Plantation / 24 |
| 151. | 36.1 | Shirley / 291 |
| 151. | 36.1 | Beaver Cove / 169 |
| 156. | 35.9 | Regional School Unit 19 / 14,878 |
| 157. | 35.8 | School Administrative District 46 / 6,518 |
| 157. | 35.8 | Seboeis Plantation / 51 |
| 157. | 35.8 | Piscataquis Unorganized Territory / 722 |
| 157. | 35.8 | School Administrative District 67 / 6,389 |
| 157. | 35.8 | School Administrative District 68 / 6,681 |
| 157. | 35.8 | School Administrative District 64 / 7,974 |
| 157. | 35.8 | Indian Island / 827 |
| 157. | 35.8 | Indian Township / 769 |
| 157. | 35.8 | Lowell / 329 |
| 157. | 35.8 | Willimantic / 105 |
| 157. | 35.8 | Lake View Plantation / 66 |
| 157. | 35.8 | Penobscot Unorganized Territory / 1,165 |
| 157. | 35.8 | Medford / 204 |
| 157. | 35.8 | Millinocket / 4,451 |
| 157. | 35.8 | Medway / 1,157 |
| 157. | 35.8 | Kingsbury Plantation / 14 |
| 157. | 35.8 | East Millinocket / 1,812 |
| 157. | 35.8 | School Administrative District 41 / 4,323 |
| 157. | 35.8 | School Administrative District 31 / 4,042 |
| 157. | 35.8 | Pleasant Ridge Plantation / 88 |
| 157. | 35.8 | Princeton / 803 |
| 157. | 35.8 | Harmony / 816 |
| 157. | 35.8 | School Administrative District 04 / 5,106 |
| 157. | 35.8 | Bowerbank / 122 |
| 181. | 35.7 | Highland Plantation / 45 |
| 182. | 35.6 | Carrabassett Valley / 561 |
| 182. | 35.6 | Talmadge / 83 |
| 182. | 35.6 | Great Lake Stream Plantation / 118 |
| 182. | 35.6 | Lakeville / 113 |
| 182. | 35.6 | Carroll Plantation / 115 |
| 182. | 35.6 | Waite / 91 |
| 188. | 35.4 | Vanceboro / 111 |
| 188. | 35.4 | Upton / 61 |
| 188. | 35.4 | Oxford Unorganized Territory / 544 |
| 188. | 35.4 | Magalloway Plantation / 46 |
| 188. | 35.4 | Lincoln Plantation / 31 |
| 193. | 35.3 | Macwahoc Plantation / 63 |
| 193. | 35.3 | School Administrative District 12 / 986 |
| 193. | 35.3 | West Forks Plantation / 31 |
| 193. | 35.3 | Somerset Unorganized Territory / 647 |
| 193. | 35.3 | Drew Plantation / 46 |
| 193. | 35.3 | School Administrative District 30 / 2,269 |
| 199. | 35.2 | Woodville / 212 |
| 199. | 35.2 | East Range Community School District / 229 |
| 199. | 35.2 | School Administrative District 09 / 17,770 |
| 202. | 35.0 | Jay / 4,851 |
| 202. | 35.0 | Regional School Unit 16 / 11,045 |
| 204. | 34.9 | School Administrative District 14 / 737 |
| 205. | 34.8 | Dennistown Plantation / 20 |
| 206. | 34.7 | School Administrative District 61 / 14,598 |
| 207. | 34.5 | Easton / 1,198 |
| 207. | 34.5 | Caswell / 246 |
| 207. | 34.5 | School Administrative District 42 / 2,252 |
| 207. | 34.5 | School Administrative District 20 / 3,447 |
| 207. | 34.5 | Bridgewater / 618 |
| 207. | 34.5 | School Administrative District 58 / 3,974 |
| 207. | 34.5 | Reed Plantation / 179 |
| 207. | 34.5 | School Administrative District 29 / 7,911 |
| 207. | 34.5 | Orient / 171 |
| 216. | 34.5 | Glenwood Plantation / 3 |
| 216. | 34.5 | Franklin Unorganized Territory / 809 |
| 216. | 34.5 | Regional School Unit 39 / 10,339 |
| 216. | 34.5 | Aroostook Unorganized Territory / 1,572 |
| 216. | 34.5 | Hersey / 83 |
| 216. | 34.5 | Dallas Plantation / 309 |
| 216. | 34.5 | Gilead / 89 |
| 216. | 34.5 | School Administrative District 24 / 2,775 |
| 216. | 34.5 | School Administrative District 25 / 2,462 |
| 216. | 34.5 | School Administrative District 32 / 2,185 |
| 216. | 34.5 | School Administrative District 01 / 12,992 |
| 216. | 34.5 | Bancroft / 70 |
| 216. | 34.5 | Rangeley / 1,168 |
| 216. | 34.5 | Rangeley Plantation / 189 |
| 216. | 34.5 | Nashville Plantation / 64 |
| 216. | 34.5 | Moro Plantation / 38 |
| 216. | 34.5 | School Administrative District 70 / 3,752 |
| 216. | 34.5 | Sandy River Plantation / 133 |
| 216. | 34.5 | Southern Aroostook Community School District / 2,771 |
| 216. | 34.5 | Coplin Plantation / 102 |
| 216. | 34.5 | School Administrative District 44 / 5,676 |
| 216. | 34.5 | School Administrative District 27 / 6,478 |
| 238. | 34.4 | School Administrative District 33 / 1,608 |
| 238. | 34.4 | Westmanland / 89 |
| 238. | 34.4 | Woodland / 1,193 |
| 238. | 34.4 | Madawaska / 3,965 |
| 238. | 34.4 | New Sweden / 611 |
| 238. | 34.4 | School Administrative District 72 / 8,110 |
| 238. | 34.4 | Grand Isle / 488 |
| 238. | 34.4 | School Administrative District 45 / 2,323 |
| 246. | 34.2 | School Administration District 10 / 215 |
| 247. | 34.1 | Regional School Unit 10 / 18,853 |
| 247. | 34.1 | School Administrative District 17 / 24,133 |
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.
