SmogRank / World / United States / Oregon / August 2023

Most polluted cities in Oregon, United States, August 2023

41 cities in Oregon, United States ranked by their average PM2.5 over the 31 days. Worst: Ashland at 47.7 µg/m³, #12 of 1,926 cities in the world. Cleanest: Florence at 4.2. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Medford 41% 40%0
Every city in Oregon, United States ranked for August 2023, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Medford
    41%
  2. 2Ashland
    39%
  3. 3Redmond
    39%
  4. 4Grants Pass
    39%
  5. 5Talent
    39%
  6. 6Bend
    39%
  7. 7Prineville
    25%
  8. 8Green
    23%
  9. 9Madras
    19%
  10. 10Cottage Grove
    19%
  11. 11Altamont
    16%
  12. 12The Dalles
    16%
  13. 13Hermiston
    10%
  14. 14Pendleton
    10%
  15. 15Hood River
    10%
  16. 16Eugene
    10%
  17. 17Sweet Home
    10%
  18. 18Hillsboro
    3%
  19. 19Stayton
    3%
  20. 20Tigard
    3%
  21. 21Silverton
    3%
  22. 22Albany
    3%
  23. 23Canby
    3%
  24. 24Beaverton
    3%
  25. 24Portland
    3%
  26. 26Gresham
    3%
  27. 27Forest Grove
    3%
  28. 28La Grande
    0%
  29. 29Baker City
    0%
  30. 30Salem
    0%
  31. 31Brookings
    0%
  32. 32Corvallis
    0%
  33. 33Woodburn
    0%
  34. 34North Portland
    0%
  35. 35McMinnville
    0%
  36. 35Milwaukie
    0%
  37. 37Dallas
    0%
  38. 38Ontario
    0%
  39. 39Coos Bay
    0%
  40. 40Newport
    0%
  41. 41Florence
    0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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SmogRank, most polluted cities in Oregon, United States, PM2.5, August 2023, smogrank.com/us/region/oregon/history/2023-08 (accessed 6 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.