Worst air pollution Heidelberg, today and tomorrow

On 21 July 2026, overall air quality in Heidelberg is fair. AQI is the main air quality indicator at 30.5/100. Pollution peaks around 4:00 PM (O3: 30.5/100).

On 22 July 2026, air quality conditions in Heidelberg will be similar to today, with AQI forecast at fair at 34.4/100. Pollution peaks around 5:00 AM (NO2: 34.4/100).

People in Heidelberg tend to notice reduced air quality when linden, chestnut, and ash pollen peaks, or on warm, stagnant days when local emissions settle; traffic on nearby roads is a modest local source. Ragweed becomes a modest late-summer presence here from mid-August onward. Wind and rain both help clear the air noticeably here.

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.