Worst air pollution Threemilestone, today and tomorrow
Today (9 August): Air quality in Threemilestone is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 38.3/100).
Tomorrow (10 August 2026): Air quality in Threemilestone is fair. All pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 28.7/100). 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 M11 represent the town's main traffic-related pollution source. Being part of Cornwall, Threemilestone sees an air quality profile that's largely down to traffic and general town-centre activity. Light prevailing breezes generally provide reasonable ventilation, keeping levels close to typical UK urban averages for a town this size.
Today - 9 August | Pollution peaks at 14:00
AQI:
Fair
38.3/100
PM2.5 (fine particles):
Good
18.5/100
PM10 (coarse particles):
Good
7.0/100
NO2 (nitrogen dioxide):
Fair
29.7/100
O3 (ozone):
Fair
38.3/100
SO2 (sulfur dioxide):
Good
5.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.4/100
PM1 (ultrafine particles):
Good
13.7/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 23:00
AQI:
Fair
28.7/100
PM2.5 (fine particles):
Good
12.5/100
PM10 (coarse particles):
Good
5.0/100
NO2 (nitrogen dioxide):
Fair
28.7/100
O3 (ozone):
Fair
23.6/100
SO2 (sulfur dioxide):
Good
3.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
8.1/100
Pollen forecast in Threemilestone
View pollen forecastFrequently Asked Questions
Is air quality bad in Threemilestone right now?
On 9 August 2026, overall air quality in Threemilestone is fair. AQI is the main air quality indicator at 38.3/100. Pollution peaks around 2:00 PM (O3: 38.3/100).
Will air quality be worse tomorrow in Threemilestone?
On 10 August 2026, air quality conditions in Threemilestone will be similar to today, with AQI forecast at fair at 28.7/100. Pollution peaks around 11:00 PM (NO2: 28.7/100).
When is air pollution at its worst in Threemilestone?
Threemilestone doesn't have one fixed air quality level — it swings between two extremes each year. Warmer months swap one problem for another — less smoke and heating pollution, but more ozone on the sunniest days. Winter mornings can be the trickiest, with cold, still conditions trapping M11 traffic fumes and smoke from home fires close to the ground. The shoulder seasons generally bring the mildest readings of the year.
Are air quality levels in Threemilestone 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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