SmogRank / Countries / United States / Washington

Most polluted cities in Washington, United States

37 measured cities, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Columbia City at 9.0 µg/m³, #544 in the world.

37 good

  1. 1Columbia City 9.00.6×
  2. 2Renton 8.00.5×
  3. 3Seattle 7.60.5×
  4. 4Tacoma 7.30.5×
  5. 5Sunnyside 7.10.5×
  6. 6Bremerton 6.00.4×
  7. 7Kent 6.00.4×
  8. 8Parkland 6.00.4×
  9. 9Marysville 5.90.4×
  10. 10Port Angeles 5.90.4×
  11. 11Mount Vernon 5.60.4×
  12. 12Lacey 5.50.4×
  13. 13Picnic Point-North Lynnwood 5.40.4×
  14. 14Burien 5.00.3×
  15. 15Centralia 4.90.3×
  16. 16North Creeklow-cost sensors 4.50.3×
  17. 17Bellevue 4.40.3×
  18. 18Longview 4.40.3×
  19. 19Pullman 4.40.3×
  20. 20Walla Walla 4.20.3×
  21. 21Salmon Creek 4.10.3×
  22. 22Aberdeen 3.90.3×
  23. 23Monroelow-cost sensors 3.70.2×
  24. 24Spokane Valley 3.60.2×
  25. 25Moses Lake 3.50.2×
  26. 26Vancouver 3.30.2×
  27. 27Bothelllow-cost sensors 3.20.2×
  28. 28Anacortes 3.00.2×
  29. 29Inglewood-Finn Hilllow-cost sensors 3.00.2×
  30. 30Pasco 2.80.2×
  31. 31Ellensburg 2.70.2×
  32. 32Kirklandlow-cost sensors 2.70.2×
  33. 33Spokane 2.70.2×
  34. 34Wenatchee 2.00.1×
  35. 35Yakima 1.80.1×
  36. 36Tri-Cities 1.70.1×
  37. 37Union Hill-Novelty Hilllow-cost sensors 1.50.1×
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 23:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.