Air Quality in Portland, United States
Windy
22.3°C · 45.4% humidity
22.3°
Feels 22.3°
42
Good
Air quality is satisfactory. Enjoy outdoor activities.
Model forecast
Nearby Monitoring Stations
Portland's air quality — share it
AQI Forecast
25
3pm
27
27
42
6pm
45
42
33
9pm
31
30
29
12am
28
28
28
3am
28
27
27
6am
27
27
27
9am
34
34
34
12pm
34
34
Air Quality Index Trend
15h · 1 stnPortland's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
45.4%
Humidity
50.3 km/h
Wind NW
1009.1 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
10.0 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for Portland?
Temperature & Precipitation
PM2.5 Trend
15h · 1 stationPM2.510.0 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX1.4
Low
What is the 7-day forecast for Portland?
08-03
22.3° 15.7°
2.0 mm
08-04
37.2° 16.4°
08-05
27.7° 19.4°
4.69 mm
08-06
28.3° 15.4°
0.81 mm
08-07
29.7° 18.5°
6.81 mm
08-08
24.5° 18.8°
08-09
38.2° 20.5°
Both models agree
Avg diff: 3.4°C
What cities are near Portland?
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-07T22:19 UTC.