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Weather tools · Air quality

Air quality in Oregon today

AQI, fine particulate and pollutant gas levels, with advice for going outdoors.

scattered clouds 46° scattered cloudsNow

Good

PM2.5 in Oregon is currently 0.9 µg/m³, within the WHO guideline.

What should you do at this air quality level?

  • The air is clean. Enjoy exercise and outdoor activities.
  • A good time to open the windows and air out your home.

Pollutants compared with WHO guidelines

PM2.5Fine particles that reach deep into the lungs and blood
0.9µg/m³ · WHO 15
PM10Coarse dust from roads and construction
1.2µg/m³ · WHO 45
NO2Vehicle exhaust and fuel burning
2.2µg/m³ · WHO 25
O3Ground-level ozone, higher in strong sunshine
31.8µg/m³ · WHO 100
SO2Coal and oil burning in industry
0.1µg/m³ · WHO 40
COIncomplete combustion, vehicle smoke
135µg/m³ · WHO 4000

The vertical line marks the World Health Organization guideline (WHO, 2021). Figures are instantaneous concentrations from the OpenWeather model and are for reference only; for official monitoring and wildfire smoke forecasts, see AirNow.gov (US EPA) and your state air agency.

Air quality ranking by state

Most polluted first
  1. 1 Michigan 71 Moderate
  2. 2 Georgia 69 Moderate
  3. 3 West Virginia 68 Moderate
  4. 4 Vermont 65 Moderate
  5. 5 Indiana 63 Moderate
  6. 6 Alabama 60 Moderate
  7. 7 Arizona 60 Moderate
  8. 8 Tennessee 59 Moderate
  9. 9 Ohio 58 Moderate
  10. 10 Kentucky 57 Moderate
  11. 11 Florida 55 Moderate
  12. 12 Illinois 55 Moderate

See temperatures nationwide →

What is the AQI?

The AQI (Air Quality Index) turns pollutant concentrations into an easy-to-read 0–500 scale: the higher the number, the more polluted the air. This page calculates the AQI on the US Environmental Protection Agency scale (US EPA, 2024 update) from PM2.5, the pollutant with the greatest health impact, the same scale used by AirNow.gov.

Fine particles tend to build up on calm mornings and evenings, during temperature inversions in winter valleys and during heavy traffic. In summer and fall, smoke from wildfires — sometimes hundreds of miles away — can push the AQI into unhealthy levels. Ground-level ozone peaks on hot, sunny afternoons. After rain or a cold front, the air is usually noticeably cleaner.

More forecasts for Oregon

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