Worst air pollution Keynsham, today and tomorrow
Today (9 August): Air quality in Keynsham is poor. AQI, NO2, and O3 are poor; PM2.5 and SO2 are fair; PM1 is medium; PM10, CO, and HCHO are good. Pollution peaks around 5:00 AM (NO2: 71.9/100).
Tomorrow (10 August 2026): Air quality in Keynsham is fair. AQI improves to fair; PM2.5 decreases to good; NO2 decreases to fair; O3 decreases to fair; SO2 decreases to good; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 5:00 PM (O3: 28.2/100). 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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The air quality picture in Keynsham reflects a typical Somerset town, with traffic emissions and local commercial activity as key contributors. The nearby M74 corridor contributes steady vehicle emissions that affect roadside readings. Inland breezes from the surrounding countryside do most of the work keeping things in check, more so than any local policy or infrastructure change.
Today - 9 August | Pollution peaks at 05:00
AQI:
Poor
71.9/100
PM2.5 (fine particles):
Fair
33.5/100
PM10 (coarse particles):
Good
9.4/100
NO2 (nitrogen dioxide):
Poor
71.9/100
O3 (ozone):
Poor
60.4/100
SO2 (sulfur dioxide):
Fair
22.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
12.8/100
PM1 (ultrafine particles):
Medium
40.4/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 17:00
AQI:
Fair
28.2/100
PM2.5 (fine particles):
Good
9.0/100
PM10 (coarse particles):
Good
3.3/100
NO2 (nitrogen dioxide):
Fair
23.6/100
O3 (ozone):
Fair
28.2/100
SO2 (sulfur dioxide):
Good
4.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
6.7/100
Pollen forecast in Keynsham
View pollen forecastFrequently Asked Questions
Is air quality bad in Keynsham right now?
On 9 August 2026, overall air quality in Keynsham is poor. AQI is the main air quality indicator at 71.9/100. Pollution peaks around 5:00 AM (NO2: 71.9/100).
Will air quality be worse tomorrow in Keynsham?
On 10 August 2026, air quality conditions in Keynsham will be better than today, with AQI forecast at fair at 28.2/100. Pollution peaks around 5:00 PM (O3: 28.2/100).
When is air pollution at its worst in Keynsham?
Seasons make a real difference to air quality in Keynsham, more than most people realise. 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 M74 traffic fumes and smoke from home fires close to the ground. Most of spring and autumn stays fairly steady, right in the middle of those two extremes.
Are air quality levels in Keynsham 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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