SmogRank / World / North America / United States / Oregon

Most polluted cities in Oregon, United States

18 measured cities, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Medford at 5.1 µg/m³, #884 in the world.

Washington: 36 measured citiesIdaho: 8 measured citiesMontana: 2 measured citiesCalifornia: 66 measured citiesOregon: 18 measured citiesNevada: 9 measured cities#18 Dallas: 1.9 µg/m³#17 Redmond: 2.1 µg/m³#16 Corvallis: 2.3 µg/m³#15 McMinnville: 2.4 µg/m³#14 Hillsboro: 2.8 µg/m³#12 Bend: 2.9 µg/m³#13 Oregon City: 2.9 µg/m³#11 Beaverton: 3.0 µg/m³#10 Milwaukie: 3.4 µg/m³#9 The Dalles: 3.5 µg/m³#8 Portland: 3.8 µg/m³#7 Albany: 4.0 µg/m³#5 Eugene: 4.6 µg/m³#6 Hermiston: 4.6 µg/m³#4 Coos Bay: 4.7 µg/m³#3 Ashland: 4.9 µg/m³#1 Medford: 5.1 µg/m³#2 Tigard: 5.1 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Medford 5.1 µg/m³ 15 µg/m³ WHO 24-hour 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. 1Medford 280.3×
  2. 2Tigard 280.3×
  3. 3Ashland 270.3×
  4. 4Coos Bay 260.3×
  5. 5Eugene 260.3×
  6. 6Hermiston 260.3×
  7. 7Albany 220.3×
  8. 8Portland 210.3×
  9. 9The Dalles 190.2×
  10. 10Milwaukie 190.2×
  11. 11Beaverton 170.2×
  12. 12Bend 160.2×
  13. 13Oregon City 160.2×
  14. 14Hillsboro 160.2×
  15. 15McMinnville 130.2×
  16. 16Corvallis 130.2×
  17. 17Redmond 120.1×
  18. 18Dallas 110.1×
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.

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SmogRank, most polluted cities in Oregon, United States, PM2.5, last 24 hours to 2 Oct 2026, 11:00 UTC, smogrank.com/us/region/oregon.

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Updated 2026-10-02 11:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.