Worst air pollution Maarssen, today and tomorrow

On 9 August 2026, overall air quality in Maarssen is poor. AQI is the main air quality indicator at 61.0/100. Pollution peaks around 5:00 PM (O3: 61.0/100).

On 10 August 2026, air quality conditions in Maarssen will be better than today, with O3 forecast at fair at 26.9/100. Pollution peaks around 7:00 AM (NO2: 48.5/100).

Maarssen typically sees the birch, oak, and pine pollen peak during spring and the start of summer, alongside calm, warm days when traffic on the A2 and industry emissions accumulate, as the periods to watch; the wooded Utrechtse Heuvelrug ridge nearby provides some buffering. Apart from these spells, Maarssen usually sees conditions fairly typical for the country as a whole.

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.