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)
27
Good
Watford, Hertfordshire
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
4.82 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
14.59 μg/m³
0
55
155
255
425
605+
23.93 ppb
0
55
71
86
201
201+
0.89 ppb
0
36
76
186
605
1005+
5.83 ppb
0
54
101
361
1250
2050+
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Watford, Hertfordshire
Watford, Hertfordshire
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AQI 16
Good
3.46μg/m³
PM2.5
12.63μg/m³
PM10
15.11ppb
O3
1.13ppb
SO2
12.55ppb
NO2
0.23ppm
CO
AQI 16
Good
2.95μg/m³
PM2.5
9.76μg/m³
PM10
12.42ppb
O3
2.51ppb
SO2
4.96ppb
NO2
0.23ppm
CO
AQI 16
Good
2.90μg/m³
PM2.5
9.43μg/m³
PM10
12.43ppb
O3
2.47ppb
SO2
7.48ppb
NO2
0.23ppm
CO
AQI 16
Good
2.90μg/m³
PM2.5
9.43μg/m³
PM10
12.43ppb
O3
2.47ppb
SO2
7.48ppb
NO2
0.23ppm
CO
AQI 16
Good
3.34μg/m³
PM2.5
8.09μg/m³
PM10
14.45ppb
O3
2.11ppb
SO2
6.06ppb
NO2
0.23ppm
CO
AQI 16
Good
3.33μg/m³
PM2.5
11.21μg/m³
PM10
14.46ppb
O3
1.70ppb
SO2
9.60ppb
NO2
0.23ppm
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 08:00:00 on 2025-07-17.
The best air quality in Watford, Hertfordshire was recorded at 08:00:00 on 2025-07-18.
The real-time air quality index in Watford, Hertfordshire is 16, 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 3.291 μg/m3.
The current PM10 levels in Watford, Hertfordshire are 9.112 μg/m3.
The current carbon monoxide (CO) level in Watford, Hertfordshire is 0.222 ppm.
The current sulfur dioxide (SO2) levels in Watford, Hertfordshire are 2.549 ppb.
The current ozone (O3) levels at Watford, Hertfordshire is 13.141 ppm.
The current nitrogen dioxide (NO2) levels at Watford, Hertfordshire is 5.743 ppb.
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