Stay updated with real-time air quality in Hemel Hempstead, 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)
26
Good
Hemel Hempstead, Hertfordshire
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
2.74 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
8.34 μg/m³
0
55
155
255
425
605+
27.73 ppb
0
55
71
86
201
201+
0.73 ppb
0
36
76
186
605
1005+
8.92 ppb
0
54
101
361
1250
2050+
0.01 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Hemel Hempstead, Hertfordshire
Hemel Hempstead, Hertfordshire
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AQI 27
Good
3.69μg/m³
PM2.5
12.80μg/m³
PM10
28.50ppb
O3
0.71ppb
SO2
8.35ppb
NO2
0.01ppm
CO
AQI 29
Good
3.96μg/m³
PM2.5
10.68μg/m³
PM10
31.33ppb
O3
0.57ppb
SO2
8.25ppb
NO2
0.01ppm
CO
AQI 30
Good
3.66μg/m³
PM2.5
11.47μg/m³
PM10
32.22ppb
O3
0.71ppb
SO2
8.38ppb
NO2
0.02ppm
CO
AQI 33
Good
4.04μg/m³
PM2.5
9.45μg/m³
PM10
35.59ppb
O3
0.72ppb
SO2
5.41ppb
NO2
0.02ppm
CO
AQI 30
Good
3.85μg/m³
PM2.5
10.37μg/m³
PM10
31.78ppb
O3
0.72ppb
SO2
5.59ppb
NO2
0.01ppm
CO
AQI 28
Good
3.52μg/m³
PM2.5
10.14μg/m³
PM10
30.32ppb
O3
0.73ppb
SO2
9.49ppb
NO2
0.01ppm
CO
Air quality data and pollutant measurements for Hertfordshire, UK adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
The air quality for Hemel Hempstead, Hertfordshire is updated every hour.
The worst air quality in Hemel Hempstead, Hertfordshire in the last 24 hours was observed at 12:00:00 on 2025-07-21.
In the last 24 hrs, the best air quality in Hemel Hempstead, Hertfordshire was observed at 06:00:00 on 2025-07-21.
The current air quality in Hemel Hempstead, Hertfordshire is 30, categorized as Good based on real-time data.
The most common pollutant in Hemel Hempstead, Hertfordshire is O3.
If the air quality in Hemel Hempstead, Hertfordshire is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Hemel Hempstead, Hertfordshire is 3.35 μg/m3.
The current PM10 concentration at Hemel Hempstead, Hertfordshire is 13.019 μg/m3.
The current carbon monoxide (CO) concentration at Hemel Hempstead, Hertfordshire is 0.02 ppm.
The current sulfur dioxide (SO2) concentration at Hemel Hempstead, Hertfordshire is 0.629 ppb.
The current ozone (O3) concentration at Hemel Hempstead, Hertfordshire is 31.526 ppm.
The current nitrogen dioxide (NO2) concentration at Hemel Hempstead, Hertfordshire is 7.247 ppb.
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