Calculation base air quality index

The index is based on a health-related assessment of hourly mean ozone and nitrogen dioxide values and of hourly moving PM10 daily mean values. For calculating the index, at least one of the three pollutants has to be measured at a station. The lack of measurements of one or two pollutants at a station is indicated by an incomplete circle:

The index is based on all three pollutants

Data incomplete: The index is based on one or two pollutants

The latest hourly concentration values of each station are categorized by the following thresholds. The pollutant with the worst index value determines the color of the total index.

IndexHourly mean value of NO2 in μg/m³Hourly moving daily mean value of PM10 in μg/m³Hourly mean value of O3 in μg/m
very poor> 200> 100> 240
poor101-20051-100181-240
moderate41-10036-50121-180
good21-4021-3561-120
very good0-200-200-60


Health advice

IndexHealth advice and recommendations
very poorNegative health effects can occur. Those who are sensitive or have pre-damaged airways should avoid physical outdoor exertion.
poorSensitive persons may experience adverse health effects. In combination with other air pollutants, this is also possible with less sensitive people. Extra sensitive people should avoid physically strenuous outdoor activities.
moderateShort-term adverse health effects are unlikely. However, effects of air pollutant combinations and of long-term exposure to an individual pollutant cannot be excluded. Additional irritation, e.g. triggered by pollen, can intensify the effect of air pollutants, so that adverse health effects on sensitive persons (e.g. suffering from asthma) can become more likely.
goodEnjoy your outdoor activities, adverse health effects are not expected.
very goodEnjoy your outdoor activities.