Air Quality in Portland, United States
Windy
33.6°C · 55.7% humidity
33.6°
Feels 39.1°
62
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
3 stations
Nearby Monitoring Stations
Portland's air quality — share it
AQI Forecast
54
12pm
54
54
62
3pm
60
58
57
6pm
56
56
55
9pm
55
55
54
12am
54
54
54
3am
54
54
54
6am
54
54
54
9am
54
54
Air Quality Index Trend
43h · 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. Current PM2.5 concentration in Portland is 1.1× the WHO 24-hour guideline of 15 µg/m³.
55.7%
Humidity
98.1 km/h
Wind SSE
1006.8 hPa
Pressure
24.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
17.11 µg/m³
PM10
34.3 µg/m³
050100150200300500
What is the weather forecast for Portland?
Temperature & Precipitation
PM2.5 Trend
43h · 1 stationPM2.517.11 µg/m³
×1.1 WHO
Moderate
PM1034.3 µg/m³
Good
UV INDEX24.9
Extreme
Station readings (3 stations within 25 km)
17.11
Median
16.75
Average
14.0
Low
19.85
High
PM2.5 µg/m³ · Model: 13.5 · Bias: -3.6
What is the 7-day forecast for Portland?
07-21
33.6° 27.1°
0.19 mm
07-22
33.4° 28.5°
0.19 mm
07-23
33.1° 26.5°
1.37 mm
07-24
34.7° 27.3°
4.06 mm
07-25
32.7° 27.4°
0.19 mm
07-26
33.0° 28.2°
0.06 mm
07-27
31.3° 27.2°
0.75 mm
Both models agree
Avg diff: 1.4°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 2026-07-21T20:45 UTC.