Worst air pollution Heerlen, today and tomorrow

On 21 July 2026, overall air quality in Heerlen is fair. AQI is the main air quality indicator at 27.6/100. Pollution peaks around 6:00 PM (O3: 27.6/100).

On 22 July 2026, air quality conditions in Heerlen will be similar to today, with AQI forecast at fair at 22.4/100. Pollution peaks around 6:00 AM (NO2: 22.4/100).

In Heerlen, air quality is most likely to dip when pollen from birch, oak, and pine peaks in the spring-to-early-summer window, or on hot, still days when local traffic on the A76 and industry let emissions build up; surrounding farmland and forest in the hills help disperse local emissions. Most weeks outside these periods bring Heerlen 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.