Worst air pollution Saint-Lô, today and tomorrow

On 21 July 2026, overall air quality in Saint-Lô is fair. AQI is the main air quality indicator at 25.5/100. Pollution peaks around 6:00 PM (O3: 25.5/100).

On 22 July 2026, air quality conditions in Saint-Lô will be similar to today, with AQI forecast at fair at 34.0/100. Pollution peaks around 7:00 PM (O3: 34.0/100).

In Saint-Lô, the worst combined pollen and air quality days tend to come when port traffic and cross-Channel shipping coincide with the peak birch and oak pollen season in spring; Channel winds provide frequent ventilation, so conditions usually improve within a day or two. The presence of dairy pasture and orchard bocage in the area adds another layer to the local pattern.

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.