Saint-Omer Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Saint-Omer is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 PM (O3: 14.6/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Saint-Omer is fair. AQI worsens to fair; PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (PM2.5: 20.0/100).
Explore Forecasts
Pollen & Mold
Air Quality in Other Cities
Pollen in Other Cities
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 | Good | 14.6/100 |
| PM2.5 (fine particles) | Good | 11.7/100 |
| PM10 (coarse particles) | Good | 7.1/100 |
| NO2 (nitrogen dioxide) | Good | 7.2/100 |
| O3 (ozone) | Good | 14.6/100 |
| SO2 (sulfur dioxide) | Good | 0.9/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 1.4/100 |
| PM1 (ultrafine particles) | Good | 3.4/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 20.0/100 |
| PM2.5 (fine particles) | Fair | 20.0/100 |
| PM10 (coarse particles) | Good | 9.8/100 |
| NO2 (nitrogen dioxide) | Good | 10.7/100 |
| O3 (ozone) | Good | 13.7/100 |
| SO2 (sulfur dioxide) | Good | 0.9/100 |
| CO (carbon monoxide) | Good | 0.6/100 |
| HCHO (formaldehyde) | Good | 1.1/100 |
| PM1 (ultrafine particles) | Good | 11.0/100 |
Local Environmental Conditions
The heart of Saint-Omer is largely built up, so vehicle exhaust and urban activity dominate the local air pollution sources. Breezes off the North Sea usually help ventilate the area. Local sources include industry. In cold weather, wood burning and other home heating become a noticeable source of fine particles. Pockets of trees and green space help filter a small share of the particles from traffic.
Ozone rises a little on sunny days from June to September, but the mild summers, around 19°C, keep it in check. From December to March, temperatures near 6°C let smoke and particles from home heating and traffic build up, especially on cold, still mornings. On the plus side, breezy weather in December, with winds near 25 km/h, tends to sweep pollution away.
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.
Frequently Asked Questions About Air Quality in Hauts-de-France
Is air quality bad in Saint-Omer right now?
On 10 October 2026, overall air quality in Saint-Omer is good. AQI is the main air quality indicator at 14.6/100. Pollution peaks around 5:00 PM (O3: 14.6/100).
Will air quality be worse tomorrow in Saint-Omer?
On 11 October 2026, air quality conditions in Saint-Omer will be worse than today, with AQI forecast at fair at 20.0/100. Pollution peaks around 11:00 PM (PM2.5: 20.0/100).
When is air pollution at its worst in Saint-Omer?
Ozone rises a little on sunny days from June to September, but the mild summers, around 19°C, keep it in check. From December to March, temperatures near 6°C let smoke and particles from home heating and traffic build up, especially on cold, still mornings. On the plus side, breezy weather in December, with winds near 25 km/h, tends to sweep pollution away.
Are air quality levels in Saint-Omer 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. |