The IAQ index refers to a specific measuring point, and its value can be as follows:
Air quality commonly accepted as satisfactory. Air pollution on this level has negligible or no influence on health.
The air quality is acceptable for most people. However, the most sensitive population group may experience discomfort.
Adverse health effects may occur in the sensitive part of the population. The major part of the population should feel relatively well.
The entire population begins to experience adverse health effects. This level can be very hazardous to the health of the most sensitive part of the population.
201-300 Very Unhealthy.
Staying under these conditions may result in serious health problems in the entirety of the population.
Serious health hazard. Staying under these conditions is considerably harmful to health.
Living under such conditions is impossible. It is unwise, unhealthy and unsafe.