Worst air pollution Leidschendam, today and tomorrow

On 9 August 2026, overall air quality in Leidschendam is fair. O3 is the main pollutant at 27.6/100. Pollution peaks around 10:00 PM (NO2: 45.1/100).

On 10 August 2026, air quality conditions in Leidschendam will be similar to today, with O3 forecast at fair at 26.8/100. Pollution peaks around 2:00 AM (NO2: 45.1/100).

Around Leidschendam, the clearest air quality dips tend to come when birch, oak, and alder pollen peaks during spring and the start of summer, or on calm, warm days when traffic on the A4 and local industry emissions accumulate; the flat polder terrain and sea proximity generally support decent air movement. Most weeks outside these periods bring Leidschendam conditions close to the broader Dutch norm.

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.