SmogRank / World / North America / United States / Oregon

Most polluted cities in Oregon, United States

27 measured cities, this year; 17 above the WHO annual guideline. Worst: Pendleton at 8.6 µg/m³, #1,450 in the world.

Washington: 35 measured citiesIdaho: 8 measured citiesMontana: 6 measured citiesCalifornia: 93 measured citiesOregon: 27 measured citiesNevada: 10 measured cities#27 Forest Grove: 3.7 µg/m³#25 Corvallis: 3.9 µg/m³#26 McMinnville: 3.9 µg/m³#24 Dallas: 4.2 µg/m³#23 Coos Bay: 4.3 µg/m³#22 Milwaukie: 4.5 µg/m³#20 Beaverton: 4.8 µg/m³#21 Portland: 4.8 µg/m³#19 Roseburg: 4.9 µg/m³#18 Woodburn: 5.0 µg/m³#17 Ashland: 5.2 µg/m³#16 Oregon City: 5.4 µg/m³#14 Canby: 5.5 µg/m³#15 Salem: 5.5 µg/m³#12 Albany: 5.6 µg/m³#13 Gresham: 5.6 µg/m³#11 Hillsboro: 5.9 µg/m³#10 Grants Pass: 6.0 µg/m³#9 Eugene: 6.1 µg/m³#8 Tigard: 6.2 µg/m³#6 Bend: 6.7 µg/m³#7 The Dalles: 6.7 µg/m³#5 Medford: 7.1 µg/m³#4 Redmond: 7.2 µg/m³#3 Altamont: 7.5 µg/m³#2 Hermiston: 7.7 µg/m³#1 Pendleton: 8.6 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Pendleton 8.6 µg/m³ 7.5 µg/m³5 WHO annual guideline0
Every measured city in Oregon, United States, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Pendleton 481.7×▼256
  2. 2Hermiston 431.5×▼293
  3. 3Altamont 421.5×▼259
  4. 4Redmond 401.4×▼285
  5. 5Medford 391.4×▼261
  6. 6Bend 371.3×▼265
  7. 7The Dalles 371.3×▼292
  8. 8Tigard 341.2×▼273
  9. 9Eugene 341.2×▼265
  10. 10Grants Pass 331.2×▼274
  11. 11Hillsboro 331.2×▼274
  12. 12Albany 311.1×▼273
  13. 13Gresham 311.1×▼272
  14. 14Canby 311.1×▼274
  15. 15Salem 311.1×▼273
  16. 16Oregon City 301.1×▼273
  17. 17Ashland 291.0×▼279
  18. 18Woodburn 281.0×▼276
  19. 19Roseburg 271.0×▼274
  20. 20Beaverton 271.0×▼272
  21. 21Portland 271.0×▼271
  22. 22Milwaukie 250.9×▼278
  23. 23Coos Bay 240.9×▼278
  24. 24Dallas 230.8×▼278
  25. 25Corvallis 220.8×▼278
  26. 26McMinnville 220.8×▼277
  27. 27Forest Grove 210.7×▼276
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

Estimated: cities without a monitor

Oregon 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
Springfield≈ 3 µg/m³Good
Aloha≈ 3 µg/m³Good
Lake Oswego≈ 3 µg/m³Good
Keizer≈ 2 µg/m³Good
Tualatin≈ 3 µg/m³Good
West Linn≈ 3 µg/m³Good
Newberg≈ 3 µg/m³Good
Wilsonville≈ 3 µg/m³Good
Klamath Falls≈ 3 µg/m³Good
Bethany≈ 3 µg/m³Good
Hayesville≈ 3 µg/m³Good
Sherwood≈ 3 µg/m³Good
Happy Valley≈ 4 µg/m³Good
Central Point≈ 3 µg/m³Good
Troutdale≈ 4 µg/m³Good
Oak Grove≈ 3 µg/m³Good
Lebanon≈ 3 µg/m³Good
Four Corners≈ 3 µg/m³Good

Bad-air episodes in Oregon

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Oregon, United States, PM2.5, this year to 2 Oct 2026, 10:00 UTC, smogrank.com/us/region/oregon?w=year.

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Updated 2026-10-02 10:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.