Stay updated with real-time air quality in Waltham Cross, 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)
22
Good
Waltham Cross, Hertfordshire
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
4.12 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
12.18 μg/m³
0
55
155
255
425
605+
22.82 ppb
0
55
71
86
201
201+
0.96 ppb
0
36
76
186
605
1005+
6.84 ppb
0
54
101
361
1250
2050+
0.24 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Waltham Cross, Hertfordshire
Waltham Cross, Hertfordshire
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AQI 27
Good
4.81μg/m³
PM2.5
19.27μg/m³
PM10
26.46ppb
O3
0.90ppb
SO2
4.67ppb
NO2
0.01ppm
CO
AQI 27
Good
4.72μg/m³
PM2.5
19.64μg/m³
PM10
26.50ppb
O3
0.88ppb
SO2
4.80ppb
NO2
0.01ppm
CO
AQI 23
Good
3.07μg/m³
PM2.5
8.99μg/m³
PM10
24.80ppb
O3
0.85ppb
SO2
5.05ppb
NO2
0.01ppm
CO
AQI 24
Good
4.12μg/m³
PM2.5
17.90μg/m³
PM10
26.27ppb
O3
0.90ppb
SO2
4.50ppb
NO2
0.01ppm
CO
AQI 23
Good
3.29μg/m³
PM2.5
9.10μg/m³
PM10
25.15ppb
O3
0.82ppb
SO2
10.29ppb
NO2
0.01ppm
CO
AQI 22
Good
3.54μg/m³
PM2.5
7.46μg/m³
PM10
24.10ppb
O3
0.83ppb
SO2
9.21ppb
NO2
0.02ppm
CO
The air quality data for Hertfordshire, UK is gathered from reliable sources such as satellites and monitoring stations, adhering to US EPA guidelines. With the help of advanced algorithms and machine learning, factors like traffic and population density are analyzed to deliver accurate and dependable results.
Source: Ambee Data Sources
Air quality updates for Waltham Cross, Hertfordshire are available every hour.
Waltham Cross, Hertfordshire experienced its worst air quality at 12:00:00, 2025-07-21.
The best air quality in Waltham Cross, Hertfordshire was observed at 09:00:00 on 2025-07-21.
The air quality in Waltham Cross, Hertfordshire right now is Good, with an AQI of 27.
In Waltham Cross, Hertfordshire, PM2.5 is the most frequently found pollutant.
When air quality in Waltham Cross, Hertfordshire is compromised, staying indoors and wearing a mask can reduce health risks.
Waltham Cross, Hertfordshire currently has a PM2.5 concentration of 4.86 μg/m3.
Waltham Cross, Hertfordshire currently has a PM10 concentration of 19.688 μg/m3.
The current carbon monoxide (CO) level in Waltham Cross, Hertfordshire is 0.01 ppm.
The current sulfur dioxide (SO2) concentration in Waltham Cross, Hertfordshire is 0.9 ppb.
Waltham Cross, Hertfordshire currently has an ozone (O3) concentration of 26.49 ppm.
The current level of nitrogen dioxide (NO2) in Waltham Cross, Hertfordshire is 4.699 ppb.
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