Worst air pollution Crowthorne, today and tomorrow
Today (20 September): Air quality in Crowthorne is fair. AQI, PM2.5, PM10, NO2, and PM1 are fair; O3, SO2, CO, and HCHO are good. Pollution peaks around 11:00 PM (PM2.5: 37.7/100).
Tomorrow (21 September 2026): Air quality in Crowthorne is moderate. AQI worsens to moderate; PM2.5 increases to moderate; NO2 increases to moderate; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 47.8/100). Airmine updates local air quality forecasts four times daily.
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The nearby M4 corridor contributes steady vehicle emissions that affect roadside readings. Air quality in Crowthorne is shaped by its location in Bracknell Forest, where vehicle traffic and everyday urban activity dominate local sources. Cooler northerly winds usually ensure decent dispersal, so levels generally stay within the moderate range typical of UK towns.
Today - 20 September | Pollution peaks at 23:00
AQI:
Fair
37.7/100
PM2.5 (fine particles):
Fair
37.7/100
PM10 (coarse particles):
Fair
24.3/100
NO2 (nitrogen dioxide):
Fair
33.9/100
O3 (ozone):
Good
19.9/100
SO2 (sulfur dioxide):
Good
5.3/100
CO (carbon monoxide):
Good
1.0/100
HCHO (formaldehyde):
Good
7.5/100
PM1 (ultrafine particles):
Fair
25.8/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 20:00
AQI:
Moderate
47.8/100
PM2.5 (fine particles):
Moderate
41.3/100
PM10 (coarse particles):
Fair
30.0/100
NO2 (nitrogen dioxide):
Moderate
47.8/100
O3 (ozone):
Fair
24.3/100
SO2 (sulfur dioxide):
Good
6.1/100
CO (carbon monoxide):
Good
1.2/100
HCHO (formaldehyde):
Good
9.2/100
PM1 (ultrafine particles):
Fair
30.9/100
Pollen forecast in Crowthorne
View pollen forecastFrequently Asked Questions
Is air quality bad in Crowthorne right now?
On 20 September 2026, overall air quality in Crowthorne is fair. AQI is the main air quality indicator at 37.7/100. Pollution peaks around 11:00 PM (PM2.5: 37.7/100).
Will air quality be worse tomorrow in Crowthorne?
On 21 September 2026, air quality conditions in Crowthorne will be worse than today, with AQI forecast at moderate at 47.8/100. Pollution peaks around 8:00 PM (NO2: 47.8/100).
When is air pollution at its worst in Crowthorne?
If you're tracking air quality in Crowthorne, expect it to move around quite a bit through the year. In deep winter, a lack of wind lets M4 traffic fumes and woodsmoke settle instead of blowing through. Warmer months swap one problem for another — less smoke and heating pollution, but more ozone on the sunniest days. Spring and autumn tend to be the calmer, more moderate stretches by comparison.
Are air quality levels in Crowthorne 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: 20 September 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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