Air Quality in Portsmouth, United States
Cloudy
9.3°C · 81.6% humidity
9.3°
Feels 5.8°
39
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Portsmouth's air quality — share it
AQI Forecast
27
9pm
27
27
39
12am
36
33
31
3am
30
29
29
6am
28
28
28
9am
27
27
34
12pm
34
27
27
3pm
27
27
27
6pm
27
27
Air Quality Index Trend
29h · 1 stnPortsmouth's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.
81.6%
Humidity
28.0 km/h
Wind W
1010.9 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
9.38 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Portsmouth?
Temperature & Precipitation
PM2.5 Trend
29h · 1 stationPM2.59.38 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for Portsmouth?
06-09
19.2° 9.3°
6.75 mm
06-10
27.3° 21.3°
0.75 mm
06-11
26.7° 11.3°
3.94 mm
06-12
33.4° 17.9°
0.63 mm
06-13
28.3° 19.6°
9.94 mm
06-14
24.9° 15.4°
0.88 mm
06-15
33.7° 18.9°
0.25 mm
Both models agree
Avg diff: 4.0°C
What cities are near Portsmouth?
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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 2026-06-09T04:01 UTC.