Worst air pollution Leiria, today and tomorrow

On 21 July 2026, overall air quality in Leiria is fair. AQI is the main air quality indicator at 36.5/100. Pollution peaks around 3:00 PM (O3: 36.5/100).

On 22 July 2026, air quality conditions in Leiria will be similar to today, with AQI forecast at fair at 38.7/100. Pollution peaks around 2:00 PM (O3: 38.7/100).

You're quickest to notice worse air in Leiria when oak and eucalyptus pollen peaks, or due to vehicle traffic on the A1 motorway and the nearby paper and pulp industry; beyond that, the area's natural ventilation keeps air quality consistently favourable through the remainder of the year.

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.