Worst air pollution Alkmaar, today and tomorrow

On 21 July 2026, overall air quality in Alkmaar is fair. AQI is the main air quality indicator at 24.0/100. Pollution peaks around 3:00 PM (O3: 24.0/100).

On 22 July 2026, air quality conditions in Alkmaar will be similar to today, with AQI forecast at fair at 23.9/100. Pollution peaks around 7:00 AM (O3: 23.9/100).

People visiting or living in Alkmaar generally notice the biggest dip in air quality over the spring and early-summer period, when birch, oak, and alder pollen peaks, or on windless, warm days when traffic on the A9 and industry emissions gather; frequent sea breezes off the coast tend to clear the air quickly. Apart from these spells, Alkmaar 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.