Air Quality in South Portland, United States
Partly Cloudy
19.6°C · 50.5% humidity
19.6°
Feels 19.6°
31
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
South Portland's air quality — share it
AQI Forecast
24
3am
24
24
31
6am
29
28
28
9am
27
26
26
12pm
28
27
27
3pm
34
34
34
6pm
34
27
54
9pm
54
54
34
12am
34
34
Air Quality Index Trend
21h · 1 stnSouth Portland's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
50.5%
Humidity
38.8 km/h
Wind W
1013.5 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.4 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for South Portland?
Temperature & Precipitation
PM2.5 Trend
21h · 1 stationPM2.57.4 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for South Portland?
06-09
33.5° 14.0°
06-10
18.5° 14.6°
1.63 mm
06-11
24.4° 8.5°
06-12
19.6° 17.1°
0.31 mm
06-13
25.6° 13.1°
25.81 mm
06-14
24.5° 9.6°
1.13 mm
06-15
23.5° 14.8°
Both models agree
Avg diff: 4.2°C
What cities are near South 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 2026-06-09T10:47 UTC.