Air quality is divided into five classes, from good to very poor. The air quality index describes the relation between these classes and health effects and norms.
xx Good – no health effects
xx Satisfactory – health effects are very unlikely
xx Fair – health effects are unlikely
xx Poor – health effects are possible in sensitive individuals
xx Very poor – health effects are possible in sensitive population groups
The air quality index is calculated for each monitoring station by the hour. The index covers all the pollutants measured at the station
- sulphur dioxide
- nitrogen dioxide
- thoracic particles
- fine particles
- carbon monoxide
The air quality index of the monitoring station is the highest measured pollutant-specific index.
The index is defined based on the guidelines, limit and threshold values of air quality, as well as on the estimate by THL specialist of the correlation between the concentrations and health risks.