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The Health Index is based on the limit values of the Federal Environment Agency, the WHO and the so-called Vienna Health Index. The air-Q health index is always calculated from the "worst" measured value from all measured variables at a certain point in time. If, for example, the increased particulate matter value leads to a 20% discount and the high nitrogen dioxide value justifies a 30% health discount, the health index shows 100% - 30% (nitrogen dioxide value) = 70%.
The calculation of the performance index is based on a different, cumulative procedure, which is based on recent studies by various research institutions that have analyzed the performance degradation of certain loads in the breathing air. For example, if the high carbon dioxide content of the air leads to a 20% performance penalty and the high temperature leads to a 5% penalty, the performance index shows 100% - 20% (CO₂ penalty) - 5% (temperature penalty) = 75%.
