Worst air pollution Saint-Omer, today and tomorrow

On 21 July 2026, overall air quality in Saint-Omer is good. AQI is the main air quality indicator at 19.2/100. Pollution peaks around 2:00 PM (O3: 19.2/100).

On 22 July 2026, air quality conditions in Saint-Omer will be worse than today, with AQI forecast at fair at 29.6/100. Pollution peaks around 6:00 PM (O3: 29.6/100).

In Saint-Omer, the worst combined pollen and air quality days tend to come when former coalfield industry and motorway traffic coincide with the peak birch and oak pollen season in spring; North Sea winds sweep across the open plains, so conditions usually improve within a day or two.

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.

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.