Air Quality in Harpenden, United Kingdom
Drizzle
8.0°C · 91.5% humidity
8.0°
Feels 4.0°
31
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model
Nearby Monitoring Stations
Harpenden's air quality — share it
AQI Forecast
Calibrated
5
12am
5
5
31
3am
24
18
15
6am
13
11
10
9am
9
8
7
12pm
6
7
6
3pm
5
6
6
6pm
6
6
6
9pm
6
6
Station readings
12h ago
AQI 4
PM2.5 1.0 µg/m³ · 12h ago
CAMS model
adj -19
24
24
24
24
24
24
24
25
25
25
25
25
25
24
25
25
24
25
25
25
25
25
25
25
Air Quality Index Trend
11h · 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.
91.5%
Humidity
29.0 km/h
Wind WNW
1020.1 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
7.47 µg/m³
PM10
13.7 µg/m³
050100150200300500
What is the weather forecast for Harpenden?
Temperature & Precipitation
PM2.5 Trend
11h · 1 stationPM2.57.47 µg/m³
✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
What is the 7-day forecast for Harpenden?
06-09
15.8° 8.0°
0.56 mm
06-10
13.3° 11.7°
7.94 mm
06-11
25.2° 13.5°
1.75 mm
06-12
20.9° 9.0°
06-13
21.6° 9.8°
0.19 mm
06-14
20.4° 10.5°
1.06 mm
06-15
16.5° 9.4°
3.69 mm
Both models agree
Avg diff: 4.0°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 2026-06-09T02:44 UTC.