Worst air pollution Chiswick, today and tomorrow
Today (20 September): Air quality in Chiswick is moderate. AQI, NO2, and PM1 are moderate; PM2.5 and PM10 are fair; O3, SO2, CO, and HCHO are good. Pollution peaks around 9:00 PM (NO2: 45.3/100).
Tomorrow (21 September 2026): Air quality in Chiswick is poor. AQI worsens to poor; PM2.5 increases to moderate; PM10 increases to moderate; NO2 increases to poor; PM1 increases to poor; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 68.8/100). 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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Like much of Hounslow, Chiswick's air quality is shaped less by industry these days and more by everyday road traffic. Thanks to inland breezes from the surrounding countryside, pollution rarely lingers for long, which keeps average readings fairly unremarkable by UK standards. Emissions along the A96 represent the town's main traffic-related pollution source.
Today - 20 September | Pollution peaks at 21:00
AQI:
Moderate
45.3/100
PM2.5 (fine particles):
Fair
36.6/100
PM10 (coarse particles):
Fair
24.8/100
NO2 (nitrogen dioxide):
Moderate
45.3/100
O3 (ozone):
Good
16.4/100
SO2 (sulfur dioxide):
Good
5.6/100
CO (carbon monoxide):
Good
0.9/100
HCHO (formaldehyde):
Good
8.3/100
PM1 (ultrafine particles):
Moderate
43.2/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 20:00
AQI:
Poor
68.8/100
PM2.5 (fine particles):
Moderate
49.2/100
PM10 (coarse particles):
Moderate
42.3/100
NO2 (nitrogen dioxide):
Poor
68.8/100
O3 (ozone):
Good
18.7/100
SO2 (sulfur dioxide):
Good
13.3/100
CO (carbon monoxide):
Good
1.6/100
HCHO (formaldehyde):
Good
19.8/100
PM1 (ultrafine particles):
Poor
63.7/100
Pollen forecast in Chiswick
View pollen forecastFrequently Asked Questions
Is air quality bad in Chiswick right now?
On 20 September 2026, overall air quality in Chiswick is moderate. AQI is the main air quality indicator at 45.3/100. Pollution peaks around 9:00 PM (NO2: 45.3/100).
Will air quality be worse tomorrow in Chiswick?
On 21 September 2026, air quality conditions in Chiswick will be worse than today, with AQI forecast at poor at 68.8/100. Pollution peaks around 8:00 PM (NO2: 68.8/100).
When is air pollution at its worst in Chiswick?
Most of spring and autumn stays fairly steady, right in the middle of those two extremes. There's a clear yearly cycle to air quality in Chiswick if you look closely. In deep winter, a lack of wind lets A96 traffic fumes and woodsmoke settle instead of blowing through. Summer sunshine can drive up ozone locally, though overall air generally moves and clears more freely than in winter.
Are air quality levels in Chiswick 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 14:33 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.
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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