Air Quality in Portsmouth, United States
Clear
27.9°C · 30.1% humidity
27.9°
Feels 27.9°
18
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Portsmouth's air quality — share it
AQI Forecast
27
7pm
27
27
18
10pm
21
22
22
1am
22
22
24
4am
24
26
27
7am
27
27
27
10am
25
27
27
1pm
34
34
34
4pm
34
34
Air Quality Index Trend
26h · 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.
30.1%
Humidity
37.5 km/h
Wind NNE
1014.4 hPa
Pressure
2.9
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
4.27 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Portsmouth?
Temperature & Precipitation
PM2.5 Trend
26h · 1 stationPM2.54.27 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX2.9
Moderate
What is the 7-day forecast for Portsmouth?
08-03
29.5° 19.4°
0.44 mm
08-04
33.8° 16.5°
0.06 mm
08-05
35.4° 14.8°
7.44 mm
08-06
36.4° 18.9°
0.75 mm
08-07
32.6° 19.2°
0.13 mm
08-08
35.0° 20.9°
16.19 mm
08-09
36.6° 21.9°
2.63 mm
Both models agree
Avg diff: 3.2°C
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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 2026-08-08T02:12 UTC.