Rankings · Health

Lowest fall aqi by state

Fall air quality index.

Average daily EPA Air Quality Index for September through November. Lower is cleaner; the AQI reports the day’s worst measured pollutant.

  1. 1Hawaii26.8
  2. 2Maine28.6
  3. 3Alaska29.3
  4. 4Vermont30.9
  5. 5New Hampshire32.7
  6. 6Rhode Island32.7
  7. 7Montana33.1
  8. 8Massachusetts33.3
  9. 9Wyoming35.0
  10. 10South Dakota35.2
  11. 11North Dakota35.3
  12. 12Virginia35.6
  13. 13New York36.2
  14. 14Nebraska36.6
  15. 15New Jersey36.7
  16. 16Maryland36.9
  17. 17West Virginia36.9
  18. 18Minnesota37.0
  19. 19Idaho38.7
  20. 20Delaware39.1
  21. 21Wisconsin39.2
  22. 22Florida39.5
  23. 23North Carolina40.9
  24. 24South Carolina41.7
  25. 25Pennsylvania41.8
  26. 26Michigan42.6
  27. 27District of Columbia42.7
  28. 28Tennessee42.7
  29. 29Oregon42.8
  30. 30Washington43.5
  31. 31Iowa43.7
  32. 32Kansas43.8
  33. 33Alabama44.2
  34. 34Georgia44.5
  35. 35Kentucky45.1
  36. 36Louisiana45.1
  37. 37Missouri45.1
  38. 38New Mexico45.4
  39. 39Colorado45.5
  40. 40Mississippi45.6
  41. 41Indiana45.8
  42. 42Utah46.1
  43. 43Ohio48.1
  44. 44Oklahoma48.8
  45. 45Arkansas49.8
  46. 46Illinois50.3
  47. 47Nevada50.4
  48. 48Texas58.1
  49. 49Arizona59.0
  50. 50California61.3

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