Worst air pollution Westminster, today and tomorrow
Today (16 July): Air quality in Westminster 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: 34.0/100).
Tomorrow (17 July 2026): Air quality in Westminster is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 43.6/100). 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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Rush-hour queues near the A26 are usually when readings climb the most. Westminster's position in Westminster means air quality is mostly determined by local road traffic and the compact scale of the centre. Moist Atlantic fronts 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
34.0/100
PM2.5 (fine particles):
Good
9.2/100
PM10 (coarse particles):
Good
3.1/100
NO2 (nitrogen dioxide):
Good
13.1/100
O3 (ozone):
Fair
34.0/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
8.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 16:00
AQI:
Medium
43.6/100
PM2.5 (fine particles):
Good
12.7/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
18.6/100
O3 (ozone):
Medium
43.6/100
SO2 (sulfur dioxide):
Good
2.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
11.8/100
Pollen forecast in Westminster
View pollen forecastFrequently Asked Questions
Is air quality bad in Westminster right now?
On 16 July 2026, overall air quality in Westminster is fair. AQI is the main air quality indicator at 34.0/100. Pollution peaks around 3:00 PM (O3: 34.0/100).
Will air quality be worse tomorrow in Westminster?
On 17 July 2026, air quality conditions in Westminster will be better than today, with AQI forecast at medium at 43.6/100. Pollution peaks around 4:00 PM (O3: 43.6/100).
When is air pollution at its worst in Westminster?
Seasons make a real difference to air quality in Westminster, more than most people realise. In summer, ozone can build up on sunny afternoons, though windier, warmer weather usually helps clear traffic-related pollution faster than in winter. Winter tends to be worst, with wood burning, home heating, and still, cold air trapping traffic fumes from the A26 closer to ground level. Spring and autumn tend to be the calmer, more moderate stretches by comparison.
Are air quality levels in Westminster 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.
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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