Worst air pollution Saint Helens, today and tomorrow
Today (16 July): Air quality in Saint Helens is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 28.3/100).
Tomorrow (17 July 2026): Air quality in Saint Helens is fair. All pollutants stay as today. Pollution peaks around 2:00 PM (O3: 27.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Emissions along the A40 represent the town's main traffic-related pollution source. Saint Helens's position in St. Helens means air quality is mostly determined by local road traffic and the compact scale of the centre. The dominant maritime airflow help ventilate the town centre, keeping air quality at moderate levels typical for the region.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
28.3/100
PM2.5 (fine particles):
Good
12.6/100
PM10 (coarse particles):
Good
4.5/100
NO2 (nitrogen dioxide):
Good
10.9/100
O3 (ozone):
Fair
28.3/100
SO2 (sulfur dioxide):
Good
2.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
10.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 14:00
AQI:
Fair
27.1/100
PM2.5 (fine particles):
Good
15.3/100
PM10 (coarse particles):
Good
5.5/100
NO2 (nitrogen dioxide):
Good
11.3/100
O3 (ozone):
Fair
27.1/100
SO2 (sulfur dioxide):
Good
2.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.6/100
PM1 (ultrafine particles):
Good
12.0/100
Pollen forecast in Saint Helens
View pollen forecastFrequently Asked Questions
Is air quality bad in Saint Helens right now?
On 16 July 2026, overall air quality in Saint Helens is fair. AQI is the main air quality indicator at 28.3/100. Pollution peaks around 3:00 PM (O3: 28.3/100).
Will air quality be worse tomorrow in Saint Helens?
On 17 July 2026, air quality conditions in Saint Helens will be similar to today, with AQI forecast at fair at 27.1/100. Pollution peaks around 2:00 PM (O3: 27.1/100).
When is air pollution at its worst in Saint Helens?
If you're tracking air quality in Saint Helens, expect it to move around quite a bit through the year. Summer's more of a mixed bag: ozone can spike in strong sun, but overall dispersion tends to be better than the depths of winter. Winter mornings can be the trickiest, with cold, still conditions trapping A40 traffic fumes and smoke from home fires close to the ground. For much of spring and autumn, things settle into a fairly unremarkable middle ground.
Are air quality levels in Saint Helens based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Want to see air quality forecasts for other cities in United Kingdom?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app