Rankings · Health

Lowest summer aqi by state

Summer air quality index.

Average daily EPA Air Quality Index for June through August. Lower is cleaner; summer ozone and wildfire smoke can make this differ sharply from the annual average.

  1. 1Alaska22.7
  2. 2Hawaii23.6
  3. 3Montana35.6
  4. 4Oregon36.9
  5. 5Washington37.6
  6. 6Idaho40.1
  7. 7Florida41.6
  8. 8Nebraska42.5
  9. 9Alabama42.7
  10. 10South Carolina42.9
  11. 11Georgia43.5
  12. 12Wyoming43.8
  13. 13Virginia44.0
  14. 14Maine44.4
  15. 15South Dakota44.4
  16. 16Louisiana44.5
  17. 17North Carolina44.5
  18. 18Mississippi44.8
  19. 19West Virginia44.9
  20. 20Tennessee46.1
  21. 21New Hampshire46.6
  22. 22Kansas47.2
  23. 23Vermont47.2
  24. 24Maryland47.3
  25. 25Missouri47.5
  26. 26Kentucky48.1
  27. 27Rhode Island48.1
  28. 28Arkansas49.0
  29. 29Massachusetts49.2
  30. 30Oklahoma50.5
  31. 31Iowa51.9
  32. 32Delaware52.1
  33. 33New Jersey52.4
  34. 34New York53.3
  35. 35Pennsylvania53.5
  36. 36Indiana54.5
  37. 37Wisconsin56.9
  38. 38Ohio57.0
  39. 39District of Columbia57.9
  40. 40Texas57.9
  41. 41New Mexico58.0
  42. 42Minnesota58.9
  43. 43Michigan59.5
  44. 44Colorado60.4
  45. 45North Dakota60.6
  46. 46Illinois65.7
  47. 47Utah66.0
  48. 48Arizona72.5
  49. 49Nevada75.2
  50. 50California87.2

Not ranked, because this measure is not published for them: Connecticut. EPA publishes this only for counties with nearby reporting monitors. A blank is no sufficiently complete monitoring record, not clean air.

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Source: EPA AirData (2025). · How this is built