SmogRank / Countries / United States / Washington

Most polluted cities in Washington, United States

41 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Sunnyside at 7.0 µg/m³, #851 in the world.

41 good

  1. 1Sunnyside 7.0
  2. 2Renton 6.5
  3. 3Columbia City 6.2
  4. 4Tacoma 6.2
  5. 5Wenatchee 6.0
  6. 6Seattle 5.9
  7. 7Vancouver 5.9
  8. 8Auburn 5.6
  9. 9Bellingham 5.6
  10. 10Kent 5.5
  11. 11Bremerton 5.3
  12. 12Moses Lake 5.1
  13. 13Pullman 5.1
  14. 14Ellensburg 4.9
  15. 15Shoreline 4.9
  16. 16Yakima 4.9
  17. 17Marysville 4.8
  18. 18Port Angeles 4.8
  19. 19Spokane Valley 4.7
  20. 20Burien 4.6
  21. 21Spokane 4.6
  22. 22Walla Walla 4.6
  23. 23Centralia 4.4
  24. 24Longview 4.4
  25. 25Parkland 4.4
  26. 26Salmon Creek 4.4
  27. 27Aberdeen 4.3
  28. 28Lacey 4.3
  29. 29Bellevue 4.2
  30. 30Kennewick 4.2
  31. 31Pasco 4.2
  32. 32Tri-Cities 4.0
  33. 33Picnic Point-North Lynnwood 3.8
  34. 34Mount Vernon 3.7
  35. 35Monroelow-cost sensors 3.4
  36. 36Inglewood-Finn Hilllow-cost sensors 3.3
  37. 37Bothelllow-cost sensors 3.2
  38. 38Anacortes 3.0
  39. 39Kirklandlow-cost sensors 2.8
  40. 40North Creeklow-cost sensors 2.7
  41. 41Union Hill-Novelty Hilllow-cost sensors 2.7
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Estimated: cities without a monitor

Washington cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Everett≈ 5 µg/m³Good
Federal Way≈ 5 µg/m³Good
Lakewood≈ 5 µg/m³Good
Olympia≈ 4 µg/m³Good
Richland≈ 4 µg/m³Good
South Hill≈ 4 µg/m³Good
Sammamish≈ 4 µg/m³Good
City of Sammamish≈ 4 µg/m³Good
Edmonds≈ 5 µg/m³Good
Puyallup≈ 4 µg/m³Good
Lynnwood≈ 5 µg/m³Good
West Lake Sammamish≈ 4 µg/m³Good
University Place≈ 5 µg/m³Good
Des Moines≈ 5 µg/m³Good
Lake Stevens≈ 4 µg/m³Good
East Hill-Meridian≈ 5 µg/m³Good
SeaTac≈ 5 µg/m³Good
Spanaway≈ 5 µg/m³Good
Maple Valley≈ 3 µg/m³Good
Mercer Island≈ 5 µg/m³Good
Bainbridge Island≈ 5 µg/m³Good
Graham≈ 4 µg/m³Good
Cottage Lake≈ 4 µg/m³Good
Kenmore≈ 5 µg/m³Good
Camas≈ 4 µg/m³Good
Mukilteo≈ 5 µg/m³Good
West Lake Stevens≈ 4 µg/m³Good
Mountlake Terrace≈ 5 µg/m³Good
Silver Firs≈ 4 µg/m³Good
Eastmont≈ 4 µg/m³Good
Mill Creek≈ 5 µg/m³Good
Tukwila≈ 5 µg/m³Good
Bonney Lake≈ 3 µg/m³Good
Hazel Dell≈ 3 µg/m³Good
Battle Ground≈ 4 µg/m³Good
Silverdale≈ 3 µg/m³Good
Covington≈ 3 µg/m³Good
Tumwater≈ 4 µg/m³Good
Fairwood≈ 5 µg/m³Good
Arlington≈ 4 µg/m³Good

Updated 2026-10-01 19:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.