SmogRank / World / United States / Washington / 2026

Most polluted cities in Washington, United States, 2026

48 cities in Washington, United States ranked by their average PM2.5 so far (278 of 365 days); 29 above the WHO annual guideline (5.0 µg/m³). Worst: Wenatchee at 10.4 µg/m³, #903 of 2,745 cities in the world. Cleanest: Anacortes at 2.7. 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.

← Moses Lake 5% 5%0
Every city in Washington, United States ranked for 2026, 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. 1Moses Lake
    5%
  2. 2Wenatchee
    5%
  3. 3Airway Heights
    5%
  4. 4Ephrata
    5%
  5. 5Quincy
    4%
  6. 6Mead
    4%
  7. 7Spokane
    4%
  8. 8Spokane Valley
    3%
  9. 9Liberty Lake
    3%
  10. 10Walla Walla
    3%
  11. 11Columbia Citylow-cost sensors
    2%
  12. 12Yakima
    2%
  13. 13Ellensburg
    2%
  14. 14Sunnyside
    2%
  15. 15Toppenish
    2%
  16. 16Pullman
    2%
  17. 17Union Hill-Novelty Hilllow-cost sensors
    2%
  18. 18Vancouver
    1%
  19. 19Grandview
    1%
  20. 20Prosser
    1%
  21. 21Kirklandlow-cost sensors
    1%
  22. 22Parkland
    1%
  23. 23North Bend
    1%
  24. 24Tri-Cities
    1%
  25. 25Bothelllow-cost sensors
    1%
  26. 26Kent
    1%
  27. 27Tacoma
    1%
  28. 28Bellevue
    1%
  29. 29Ridgefield
    1%
  30. 30Auburn
    1%
  31. 31Renton
    0%
  32. 32Chehalis
    0%
  33. 33White Center
    0%
  34. 34Seattle
    0%
  35. 35Bellingham
    0%
  36. 35Port Angeles
    0%
  37. 37Picnic Point-North Lynnwood
    0%
  38. 38Shoreline
    0%
  39. 39Bremerton
    0%
  40. 39Lynden
    0%
  41. 41Lacey
    0%
  42. 42Burien
    0%
  43. 43Longview
    0%
  44. 44Shelton
    0%
  45. 45Port Townsend
    0%
  46. 46Aberdeen
    0%
  47. 47Mount Vernon
    0%
  48. 48Anacortes
    0%

Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.

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

All cities in the world, 2026 · All cities in United States, 2026 · Washington now

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SmogRank, most polluted cities in Washington, United States, PM2.5, 2026 (so far), smogrank.com/us/region/washington/history/2026 (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.