Stay updated with real-time air quality in Welwyn Garden City, 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)
38
Good
Welwyn Garden City, Hertfordshire
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
6.61 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
13.67 μg/m³
0
55
155
255
425
605+
33.11 ppb
0
55
71
86
201
201+
0.84 ppb
0
36
76
186
605
1005+
6.47 ppb
0
54
101
361
1250
2050+
0.23 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Welwyn Garden City, Hertfordshire
Welwyn Garden City, Hertfordshire
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AQI 33
Good
6.44μg/m³
PM2.5
13.03μg/m³
PM10
33.38ppb
O3
0.85ppb
SO2
6.39ppb
NO2
0.23ppm
CO
AQI 33
Good
6.46μg/m³
PM2.5
10.96μg/m³
PM10
35.44ppb
O3
0.85ppb
SO2
6.68ppb
NO2
0.23ppm
CO
AQI 38
Good
6.60μg/m³
PM2.5
13.85μg/m³
PM10
33.13ppb
O3
0.84ppb
SO2
6.32ppb
NO2
0.23ppm
CO
AQI 44
Good
7.51μg/m³
PM2.5
15.55μg/m³
PM10
35.68ppb
O3
0.82ppb
SO2
5.25ppb
NO2
0.23ppm
CO
AQI 38
Good
6.61μg/m³
PM2.5
13.86μg/m³
PM10
33.12ppb
O3
0.83ppb
SO2
6.00ppb
NO2
0.23ppm
CO
AQI 38
Good
6.80μg/m³
PM2.5
12.28μg/m³
PM10
33.99ppb
O3
0.91ppb
SO2
3.88ppb
NO2
0.23ppm
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 Welwyn Garden City, Hertfordshire is updated every hour.
The worst air quality in Welwyn Garden City, Hertfordshire in the last 24 hours was observed at 10:00:00 on 2025-06-14.
In the last 24 hrs, the best air quality in Welwyn Garden City, Hertfordshire was observed at 08:00:00 on 2025-06-15.
The current air quality in Welwyn Garden City, Hertfordshire is 38, categorized as Good based on real-time data.
The most common pollutant in Welwyn Garden City, Hertfordshire is PM2.5.
If the air quality in Welwyn Garden City, Hertfordshire is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Welwyn Garden City, Hertfordshire is 6.605 μg/m3.
The current PM10 concentration at Welwyn Garden City, Hertfordshire is 13.667 μg/m3.
The current carbon monoxide (CO) concentration at Welwyn Garden City, Hertfordshire is 0.235 ppm.
The current sulfur dioxide (SO2) concentration at Welwyn Garden City, Hertfordshire is 0.845 ppb.
The current ozone (O3) concentration at Welwyn Garden City, Hertfordshire is 33.108 ppm.
The current nitrogen dioxide (NO2) concentration at Welwyn Garden City, Hertfordshire is 6.471 ppb.
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