Rankings · Health

Lowest spring aqi by state

Spring air quality index.

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

  1. 1Alaska25.5
  2. 2Montana30.7
  3. 3Oregon32.1
  4. 4Hawaii32.6
  5. 5Washington33.5
  6. 6Idaho34.5
  7. 7Vermont35.7
  8. 8Rhode Island37.3
  9. 9South Dakota37.3
  10. 10Wisconsin39.1
  11. 11West Virginia39.5
  12. 12New York39.7
  13. 13Maine39.9
  14. 14Nebraska40.2
  15. 15New Hampshire40.8
  16. 16New Jersey40.8
  17. 17Virginia40.8
  18. 18Minnesota40.9
  19. 19Massachusetts41.3
  20. 20Wyoming41.8
  21. 21Kentucky42.7
  22. 22Maryland42.9
  23. 23Indiana43.6
  24. 24Michigan43.6
  25. 25Pennsylvania44.1
  26. 26North Dakota44.3
  27. 27Tennessee44.6
  28. 28Ohio45.1
  29. 29Delaware45.4
  30. 30Iowa45.6
  31. 31Illinois45.6
  32. 32District of Columbia45.9
  33. 33Georgia45.9
  34. 34Louisiana46.0
  35. 35Alabama46.1
  36. 36North Carolina46.3
  37. 37Missouri46.4
  38. 38Mississippi46.5
  39. 39South Carolina48.0
  40. 40Arkansas48.5
  41. 41Kansas48.9
  42. 42Florida50.1
  43. 43Oklahoma54.2
  44. 44Colorado54.9
  45. 45Utah58.2
  46. 46Texas60.5
  47. 47Nevada60.6
  48. 48California63.3
  49. 49New Mexico67.9
  50. 50Arizona71.5

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