Local Data Search
A total of 88 results found. Show Results on Map.
| Rank | Air Quality Index ▼ | County / Population |
| 1. | 54.2 | Hamilton, OH / 803,272 |
| 2. | 52.7 | Warren, OH / 217,623 |
| 3. | 51.7 | Cuyahoga, OH / 1,267,513 |
| 3. | 51.7 | Highland, OH / 43,266 |
| 5. | 51.6 | Tuscarawas, OH / 92,616 |
| 6. | 51.5 | Ross, OH / 77,552 |
| 7. | 51.5 | Adams, OH / 28,342 |
| 7. | 51.5 | Holmes, OH / 43,176 |
| 9. | 51.4 | Butler, OH / 371,154 |
| 10. | 51.3 | Fayette, OH / 28,875 |
| 11. | 50.8 | Jefferson, OH / 68,510 |
| 12. | 50.7 | Harrison, OH / 15,698 |
| 12. | 50.7 | Gallia, OH / 30,763 |
| 14. | 50.5 | Licking, OH / 167,911 |
| 14. | 50.5 | Coshocton, OH / 36,768 |
| 16. | 50.5 | Madison, OH / 43,326 |
| 17. | 50.3 | Fairfield, OH / 148,067 |
| 17. | 50.3 | Pickaway, OH / 56,279 |
| 17. | 50.3 | Stark, OH / 375,090 |
| 20. | 50.2 | Morgan, OH / 14,977 |
| 21. | 50.1 | Franklin, OH / 1,197,592 |
| 22. | 50.0 | Carroll, OH / 28,539 |
| 23. | 49.9 | Montgomery, OH / 534,801 |
| 23. | 49.9 | Vinton, OH / 13,319 |
| 25. | 49.7 | Noble, OH / 14,561 |
| 25. | 49.7 | Clinton, OH / 41,871 |
| 25. | 49.7 | Washington, OH / 61,473 |
| 28. | 49.6 | Morrow, OH / 34,991 |
| 28. | 49.6 | Champaign, OH / 39,628 |
| 28. | 49.6 | Wayne, OH / 114,978 |
| 31. | 49.5 | Marion, OH / 66,171 |
| 31. | 49.5 | Knox, OH / 61,063 |
| 33. | 49.5 | Columbiana, OH / 106,622 |
| 33. | 49.5 | Union, OH / 53,090 |
| 35. | 49.4 | Athens, OH / 64,840 |
| 35. | 49.4 | Meigs, OH / 23,564 |
| 35. | 49.4 | Delaware, OH / 181,821 |
| 38. | 49.3 | Perry, OH / 36,000 |
| 39. | 49.2 | Greene, OH / 163,313 |
| 39. | 49.2 | Muskingum, OH / 85,947 |
| 41. | 49.1 | Belmont, OH / 69,793 |
| 41. | 49.1 | Logan, OH / 45,564 |
| 41. | 49.1 | Monroe, OH / 14,590 |
| 44. | 48.9 | Pike, OH / 28,504 |
| 44. | 48.9 | Jackson, OH / 32,952 |
| 44. | 48.9 | Scioto, OH / 78,520 |
| 47. | 48.8 | Hardin, OH / 31,826 |
| 48. | 48.7 | Clark, OH / 137,303 |
| 48. | 48.7 | Hocking, OH / 29,111 |
| 50. | 48.6 | Miami, OH / 103,145 |
| 50. | 48.6 | Brown, OH / 44,464 |
| 52. | 48.3 | Darke, OH / 52,537 |
| 52. | 48.3 | Guernsey, OH / 39,794 |
| 52. | 48.3 | Shelby, OH / 49,165 |
| 55. | 48.2 | Preble, OH / 41,887 |
| 56. | 48.0 | Trumbull, OH / 207,596 |
| 57. | 47.9 | Lawrence, OH / 62,100 |
| 58. | 47.8 | Auglaize, OH / 45,867 |
| 59. | 47.6 | Crawford, OH / 43,036 |
| 60. | 47.5 | Summit, OH / 541,464 |
| 61. | 47.5 | Clermont, OH / 199,450 |
| 61. | 47.5 | Portage, OH / 161,553 |
| 61. | 47.5 | Mahoning, OH / 235,809 |
| 64. | 47.4 | Defiance, OH / 38,795 |
| 64. | 47.4 | Paulding, OH / 19,293 |
| 64. | 47.4 | Williams, OH / 37,493 |
| 67. | 47.1 | Wyandot, OH / 22,535 |
| 68. | 46.9 | Richland, OH / 122,813 |
| 69. | 46.8 | Allen, OH / 105,562 |
| 70. | 46.7 | Mercer, OH / 40,789 |
| 70. | 46.7 | Medina, OH / 174,091 |
| 72. | 46.6 | Hancock, OH / 75,290 |
| 73. | 46.5 | Van Wert, OH / 28,612 |
| 73. | 46.5 | Seneca, OH / 56,100 |
| 73. | 46.5 | Fulton, OH / 42,541 |
| 73. | 46.5 | Sandusky, OH / 60,498 |
| 77. | 46.5 | Wood, OH / 128,139 |
| 77. | 46.5 | Henry, OH / 28,074 |
| 79. | 46.1 | Putnam, OH / 34,256 |
| 80. | 45.5 | Ashland, OH / 53,202 |
| 80. | 45.5 | Ottawa, OH / 41,304 |
| 82. | 45.5 | Lucas, OH / 438,167 |
| 83. | 44.9 | Geauga, OH / 93,819 |
| 84. | 44.6 | Lake, OH / 229,602 |
| 85. | 44.1 | Ashtabula, OH / 100,346 |
| 85. | 44.1 | Lorain, OH / 302,465 |
| 85. | 44.1 | Erie, OH / 76,416 |
| 88. | 43.9 | Huron, OH / 59,186 |
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.