Stay updated with real-time air quality in Watford, 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
Watford, Hertfordshire
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
8.26 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
18.87 μg/m³
0
55
155
255
425
605+
35.59 ppb
0
55
71
86
201
201+
0.86 ppb
0
36
76
186
605
1005+
7.04 ppb
0
54
101
361
1250
2050+
0.27 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Watford, Hertfordshire
Watford, Hertfordshire
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AQI 49
Good
8.74μg/m³
PM2.5
19.37μg/m³
PM10
36.05ppb
O3
0.80ppb
SO2
14.41ppb
NO2
0.27ppm
CO
AQI 49
Good
9.07μg/m³
PM2.5
21.79μg/m³
PM10
37.56ppb
O3
0.83ppb
SO2
5.20ppb
NO2
0.27ppm
CO
AQI 44
Good
7.92μg/m³
PM2.5
17.38μg/m³
PM10
35.05ppb
O3
0.84ppb
SO2
7.16ppb
NO2
0.27ppm
CO
AQI 44
Good
7.92μg/m³
PM2.5
17.38μg/m³
PM10
35.05ppb
O3
0.84ppb
SO2
7.16ppb
NO2
0.27ppm
CO
AQI 49
Good
9.46μg/m³
PM2.5
18.24μg/m³
PM10
36.47ppb
O3
0.85ppb
SO2
7.16ppb
NO2
0.27ppm
CO
AQI 49
Good
9.32μg/m³
PM2.5
20.08μg/m³
PM10
35.63ppb
O3
0.83ppb
SO2
10.10ppb
NO2
0.27ppm
CO
Air quality measurements for Hertfordshire, UK meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Air quality data for Watford, Hertfordshire is updated on an hourly basis.
The worst air quality in Watford, Hertfordshire was recorded at 02:00:00 on 2025-06-13.
The best air quality in Watford, Hertfordshire was recorded at 10:00:00 on 2025-06-13.
The real-time air quality index in Watford, Hertfordshire is 44, currently categorized as Good.
The most common pollutant in Watford, Hertfordshire is PM2.5.
If the air quality in Watford, Hertfordshire is poor, limit outdoor activities and use a mask to safeguard your health.
The measured PM2.5 levels in Watford, Hertfordshire at present are 8.261 μg/m3.
The current PM10 levels in Watford, Hertfordshire are 18.869 μg/m3.
The current carbon monoxide (CO) level in Watford, Hertfordshire is 0.266 ppm.
The current sulfur dioxide (SO2) levels in Watford, Hertfordshire are 0.857 ppb.
The current ozone (O3) levels at Watford, Hertfordshire is 35.587 ppm.
The current nitrogen dioxide (NO2) levels at Watford, Hertfordshire is 7.035 ppb.
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