Rankings · Health

The states with the cleanest air

Fine particulate matter.

Average daily PM2.5 in micrograms per cubic metre — the fine particles from vehicle exhaust, industry and wildfire smoke that penetrate deepest into the lungs. The EPA annual standard is 9. Western counties can read high in wildfire years.

  1. 1Hawaii3.8 µg
  2. 2Wyoming5.1 µg
  3. 3New Hampshire5.2 µg
  4. 4Maine5.9 µg
  5. 5North Dakota5.9 µg
  6. 6South Dakota5.9 µg
  7. 7Vermont6.3 µg
  8. 8Montana6.4 µg
  9. 9Alaska6.6 µg
  10. 10Maryland6.6 µg
  11. 11Nebraska6.8 µg
  12. 12Virginia6.9 µg
  13. 13West Virginia6.9 µg
  14. 14Massachusetts7.0 µg
  15. 15Rhode Island7.0 µg
  16. 16Minnesota7.1 µg
  17. 17North Carolina7.4 µg
  18. 18New Mexico7.5 µg
  19. 19New York7.7 µg
  20. 20South Carolina7.7 µg
  21. 21Colorado7.8 µg
  22. 22District of Columbia7.8 µg
  23. 23Delaware7.8 µg
  24. 24Michigan7.8 µg
  25. 25Tennessee8.0 µg
  26. 26Florida8.1 µg
  27. 27Iowa8.1 µg
  28. 28Kansas8.1 µg
  29. 29Wisconsin8.1 µg
  30. 30Missouri8.2 µg
  31. 31New Jersey8.2 µg
  32. 32Louisiana8.3 µg
  33. 33Kentucky8.4 µg
  34. 34Arkansas8.5 µg
  35. 35Alabama8.6 µg
  36. 36Pennsylvania8.6 µg
  37. 37Idaho8.7 µg
  38. 38Georgia8.8 µg
  39. 39Ohio8.8 µg
  40. 40Utah8.9 µg
  41. 41Mississippi9.0 µg
  42. 42Indiana9.1 µg
  43. 43Oklahoma9.2 µg
  44. 44Texas9.4 µg
  45. 45Illinois9.7 µg
  46. 46Washington10.5 µg
  47. 47Arizona10.8 µg
  48. 48Nevada11.5 µg
  49. 49California14.8 µg
  50. 50Oregon15.8 µg

Not ranked, because this measure is not published for them: Connecticut. Depends on an EPA air monitor being sited nearby; many rural counties have none.

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Source: County Health Rankings / EPA. · How this is built