Air Quality in Portland, United States
Windy
28.8°C · 54.0% humidity
28.8°
Feels 31.9°
32
Good
Air quality is satisfactory. Enjoy outdoor activities.
2 stations
Nearby Monitoring Stations
Portland's air quality — share it
AQI Forecast
27
2pm
27
27
32
5pm
31
30
27
8pm
26
26
26
11pm
25
25
25
2am
25
25
25
5am
25
25
25
8am
25
25
27
11am
27
27
Air Quality Index Trend
41h · 2 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. Current PM2.5 concentration in Portland is 1.6× the WHO annual guideline of 5 µg/m³.
54.0%
Humidity
88.7 km/h
Wind SE
1009.1 hPa
Pressure
6.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5
7.79 µg/m³
PM10▲
59.3 µg/m³
050100150200300500
What is the weather forecast for Portland?
Temperature & Precipitation
PM2.5 Trend
41h · 2 stationsPM2.57.79 µg/m³
✓ WHO
Good
PM1059.3 µg/m³
Moderate
UV INDEX6.9
High
Station readings (2 stations within 25 km)
7.79
Median
7.88
Average
7.35
Low
8.4
High
PM2.5 µg/m³ · Model: 17.25 · Bias: +9.5
What is the 7-day forecast for Portland?
05-28
32.3° 25.0°
0.13 mm
05-29
30.2° 22.7°
26.63 mm
05-30
28.7° 25.5°
0.31 mm
05-31
31.4° 19.6°
06-01
31.9° 25.3°
0.19 mm
06-02
31.8° 25.0°
0.06 mm
06-03
30.0° 25.4°
0.13 mm
Both models agree
Avg diff: 1.8°C
Where are air quality stations near Portland?
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-28T22:52 UTC.