St Paul's Cathedral, London Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in St Paul's Cathedral is fair. AQI and NO2 are fair; PM2.5, PM10, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 PM (NO2: 21.8/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in St Paul's Cathedral is moderate. AQI worsens to moderate; PM2.5 increases to fair; PM10 increases to fair; NO2 increases to moderate; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 48.1/100).
Explore Forecasts
Pollen & Mold
Air Quality for Neighborhoods
Get More in Our App
Local pollen and air quality forecasts, interactive pollen maps and route profiles
Features and forecast availability vary by region.
Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 21.8/100 |
| PM2.5 (fine particles) | Good | 14.3/100 |
| PM10 (coarse particles) | Good | 12.0/100 |
| NO2 (nitrogen dioxide) | Fair | 21.8/100 |
| O3 (ozone) | Good | 17.9/100 |
| SO2 (sulfur dioxide) | Good | 1.6/100 |
| CO (carbon monoxide) | Good | 0.6/100 |
| HCHO (formaldehyde) | Good | 2.4/100 |
| PM1 (ultrafine particles) | Good | 5.3/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 48.1/100 |
| PM2.5 (fine particles) | Fair | 36.8/100 |
| PM10 (coarse particles) | Fair | 24.6/100 |
| NO2 (nitrogen dioxide) | Moderate | 48.1/100 |
| O3 (ozone) | Good | 16.3/100 |
| SO2 (sulfur dioxide) | Good | 7.0/100 |
| CO (carbon monoxide) | Good | 0.9/100 |
| HCHO (formaldehyde) | Good | 10.8/100 |
| PM1 (ultrafine particles) | Fair | 27.3/100 |
Local Environmental Conditions
With buildings covering much of the area around this site in London, traffic and other urban emissions are the biggest local influence on air quality. In cold weather, wood burning and other home heating become a noticeable source of fine particles. Winds here are fairly strong, averaging around 20 km/h, which helps disperse local pollution. Air arriving from elsewhere in the region adds to what is produced locally.
With summer temperatures averaging only about 18°C, ozone rarely becomes a serious problem. In contrast, cold spells from November to March, at around 4°C on average, are when smoke from home heating and traffic lingers longest. December is usually the windiest month, averaging about 20 km/h, which helps keep the air clean.
Get pollen & AQ on Strava
Follow your environmental exposure and performance with the free Airmine-Strava integration. See your pollen and air quality exposure for every Strava activity.
Resource Hub
Air quality forecast neighborhoods 31 neighborhoods
Frequently Asked Questions About Air Quality in London, City of
Is air quality bad in St Paul's Cathedral right now?
On 10 October 2026, overall air quality in St Paul's Cathedral is fair. AQI is the main air quality indicator at 21.8/100. Pollution peaks around 7:00 PM (NO2: 21.8/100).
Will air quality be worse tomorrow in St Paul's Cathedral?
On 11 October 2026, air quality conditions in St Paul's Cathedral will be worse than today, with AQI forecast at moderate at 48.1/100. Pollution peaks around 8:00 PM (NO2: 48.1/100).
When is air pollution at its worst in St Paul's Cathedral?
With summer temperatures averaging only about 18°C, ozone rarely becomes a serious problem. In contrast, cold spells from November to March, at around 4°C on average, are when smoke from home heating and traffic lingers longest. December is usually the windiest month, averaging about 20 km/h, which helps keep the air clean.
Are air quality levels in St Paul's Cathedral 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.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |