Stay updated with real-time air quality in Letchworth, 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)
56
Moderate
Letchworth, Hertfordshire
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
11.52 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
23.44 μg/m³
0
55
155
255
425
605+
52.15 ppb
0
55
71
86
201
201+
1.74 ppb
0
36
76
186
605
1005+
3.41 ppb
0
54
101
361
1250
2050+
0.02 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Letchworth, Hertfordshire
Letchworth, Hertfordshire
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AQI 44
Good
8.01μg/m³
PM2.5
21.96μg/m³
PM10
32.80ppb
O3
1.14ppb
SO2
5.46ppb
NO2
0.35ppm
CO
AQI 44
Good
8.01μg/m³
PM2.5
21.96μg/m³
PM10
32.80ppb
O3
1.14ppb
SO2
5.46ppb
NO2
0.35ppm
CO
AQI 44
Good
7.80μg/m³
PM2.5
18.25μg/m³
PM10
34.66ppb
O3
1.13ppb
SO2
9.69ppb
NO2
0.35ppm
CO
AQI 44
Good
7.80μg/m³
PM2.5
18.25μg/m³
PM10
34.66ppb
O3
1.13ppb
SO2
9.69ppb
NO2
0.35ppm
CO
AQI 44
Good
8.01μg/m³
PM2.5
21.96μg/m³
PM10
32.80ppb
O3
1.14ppb
SO2
5.46ppb
NO2
0.35ppm
CO
AQI 44
Good
7.87μg/m³
PM2.5
24.92μg/m³
PM10
34.06ppb
O3
1.16ppb
SO2
7.10ppb
NO2
0.29ppm
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 Letchworth, Hertfordshire is updated every hour for accuracy.
In the past 24 hours, the air quality in Letchworth, Hertfordshire was at its worst at 09:00:00 on 2025-06-18.
In the last 24 hours, the best air quality in Letchworth, Hertfordshire was observed at 01:00:00 on 2025-06-18.
As of now, the AQI in Letchworth, Hertfordshire is 49, indicating Good conditions.
Letchworth, Hertfordshire air has the highest levels of PM2.5.
Poor air quality in Letchworth, Hertfordshire means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Letchworth, Hertfordshire are currently 9.069 μg/m3.
The PM10 concentration in Letchworth, Hertfordshire is 20.263 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Letchworth, Hertfordshire is 0.356 ppm.
Currently, Letchworth, Hertfordshire has a sulfur dioxide (SO2) concentration of 1.057 ppb.
The current ozone (O3) level in Letchworth, Hertfordshire at the moment is 37.675 ppm.
Nitrogen dioxide (NO2) level in Letchworth, Hertfordshire at the moment is 17.351 ppb.
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