Stay updated with real-time air quality in St Helens, Merseyside 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)
21
Good
St Helens, Merseyside
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
1.24 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
5.04 μg/m³
0
55
155
255
425
605+
22.61 ppb
0
55
71
86
201
201+
0.68 ppb
0
36
76
186
605
1005+
2.46 ppb
0
54
101
361
1250
2050+
0.25 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
St Helens, Merseyside
St Helens, Merseyside
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AQI 24
Good
1.79μg/m³
PM2.5
5.32μg/m³
PM10
25.66ppb
O3
0.68ppb
SO2
3.59ppb
NO2
0.26ppm
CO
AQI 24
Good
2.23μg/m³
PM2.5
5.73μg/m³
PM10
26.45ppb
O3
0.60ppb
SO2
3.76ppb
NO2
0.26ppm
CO
AQI 23
Good
1.70μg/m³
PM2.5
5.58μg/m³
PM10
24.74ppb
O3
0.73ppb
SO2
3.21ppb
NO2
0.26ppm
CO
AQI 22
Good
2.43μg/m³
PM2.5
5.23μg/m³
PM10
24.25ppb
O3
0.77ppb
SO2
3.29ppb
NO2
0.26ppm
CO
AQI 25
Good
3.44μg/m³
PM2.5
6.96μg/m³
PM10
26.57ppb
O3
0.49ppb
SO2
3.23ppb
NO2
0.26ppm
CO
AQI 22
Good
2.11μg/m³
PM2.5
5.63μg/m³
PM10
24.30ppb
O3
0.78ppb
SO2
3.12ppb
NO2
0.26ppm
CO
Air quality data and pollutant measurements for Merseyside, 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 St Helens, Merseyside is updated every hour.
The worst air quality in St Helens, Merseyside in the last 24 hours was observed at 03:00:00 on 2025-07-22.
In the last 24 hrs, the best air quality in St Helens, Merseyside was observed at 01:00:00 on 2025-07-22.
The current air quality in St Helens, Merseyside is 23, categorized as Good based on real-time data.
The most common pollutant in St Helens, Merseyside is O3.
If the air quality in St Helens, Merseyside is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at St Helens, Merseyside is 1.236 μg/m3.
The current PM10 concentration at St Helens, Merseyside is 5.025 μg/m3.
The current carbon monoxide (CO) concentration at St Helens, Merseyside is 0.24 ppm.
The current sulfur dioxide (SO2) concentration at St Helens, Merseyside is 0.659 ppb.
The current ozone (O3) concentration at St Helens, Merseyside is 24.912 ppm.
The current nitrogen dioxide (NO2) concentration at St Helens, Merseyside is 3.028 ppb.
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