Air Quality in Harpenden, United Kingdom
Overcast
13.3°C · 98.6% humidity
13.3°
Feels 13.3°
35
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Harpenden's air quality — share it
AQI Forecast
Calibrated
4
7pm
4
4
35
10pm
26
20
15
1am
11
9
7
4am
7
6
6
7am
5
5
7
10am
6
6
4
1pm
6
6
6
4pm
6
6
Station readings
5
4
CAMS model
adj -21
25
25
25
25
25
25
25
24
24
24
25
25
25
25
25
27
27
27
25
27
27
27
27
27
Air Quality Index Trend
26h · 1 stnHarpenden's air quality is shaped by traffic emissions and residential heating. Pollution levels tend to peak during winter months when cold air traps emissions close to ground level.
98.6%
Humidity
31.0 km/h
Wind NNE
1008.2 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
8.51 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Harpenden?
Temperature & Precipitation
PM2.5 Trend
26h · 1 stationPM2.58.51 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for Harpenden?
05-29
16.1° 11.8°
1.56 mm
05-30
17.7° 11.3°
0.88 mm
05-31
18.1° 8.6°
06-01
19.4° 8.3°
0.56 mm
06-02
19.0° 10.7°
1.75 mm
06-03
15.9° 10.5°
0.06 mm
06-04
28.6° 17.6°
3.94 mm
Both models agree
Avg diff: 3.6°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 2026-05-29T21:40 UTC.