Stay updated with real-time air quality in Harpenden, Hertfordshire featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
44
Good
Harpenden, Hertfordshire
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
6.18 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
36.29 μg/m³
0
55
155
255
425
605+
48.26 ppb
0
55
71
86
201
201+
1.35 ppb
0
36
76
186
605
1005+
11.35 ppb
0
54
101
361
1250
2050+
0.01 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Harpenden, Hertfordshire
Harpenden, Hertfordshire
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AQI 44
Good
7.74μg/m³
PM2.5
17.40μg/m³
PM10
33.11ppb
O3
0.86ppb
SO2
13.83ppb
NO2
0.01ppm
CO
AQI 33
Good
6.42μg/m³
PM2.5
21.54μg/m³
PM10
24.94ppb
O3
0.98ppb
SO2
8.75ppb
NO2
0.01ppm
CO
AQI 33
Good
5.81μg/m³
PM2.5
21.43μg/m³
PM10
24.15ppb
O3
1.00ppb
SO2
7.13ppb
NO2
0.01ppm
CO
AQI 44
Good
8.44μg/m³
PM2.5
19.32μg/m³
PM10
44.02ppb
O3
0.98ppb
SO2
5.94ppb
NO2
0.01ppm
CO
AQI 33
Good
6.42μg/m³
PM2.5
21.54μg/m³
PM10
24.94ppb
O3
0.98ppb
SO2
8.75ppb
NO2
0.01ppm
CO
AQI 33
Good
6.02μg/m³
PM2.5
20.65μg/m³
PM10
36.30ppb
O3
0.98ppb
SO2
9.86ppb
NO2
0.02ppm
CO
Air quality and pollutant data for Hertfordshire, UK are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Harpenden, Hertfordshire is updated every hour for accuracy.
In the past 24 hours, the air quality in Harpenden, Hertfordshire was at its worst at 05:00:00 on 2025-06-19.
In the last 24 hours, the best air quality in Harpenden, Hertfordshire was observed at 01:00:00 on 2025-06-18.
As of now, the AQI in Harpenden, Hertfordshire is 38, indicating Good conditions.
Harpenden, Hertfordshire air has the highest levels of PM2.5.
Poor air quality in Harpenden, Hertfordshire means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Harpenden, Hertfordshire are currently 6.947 μg/m3.
The PM10 concentration in Harpenden, Hertfordshire is 18.367 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Harpenden, Hertfordshire is 0.016 ppm.
Currently, Harpenden, Hertfordshire has a sulfur dioxide (SO2) concentration of 0.939 ppb.
The current ozone (O3) level in Harpenden, Hertfordshire at the moment is 25.554 ppm.
Nitrogen dioxide (NO2) level in Harpenden, Hertfordshire at the moment is 8.606 ppb.
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