The air pollution index forecast is issued for four different areas. It is based upon the forecast of wind and temperature up to 120 m above the ground, calculated by a meteorological forecast model. Data from the meteorological model have been analysed together with measurements of four components of air pollution to create the statistical relations between pollution level and meteorological forecast values of wind and temperature. The air pollution components considered in the model are dust, ozone, sulphur doixide and nitrogen oxides. The calculated forecast is given as good (green), moderate (yellow) or poor (red) air quality according to the air quality index calculated for each pollutant.

For ozone and dust, the pollution level will be rather uniform for an area.
For nitrogen oxides, the highest concentrations will occur close to roads with high traffic, and the concentration level will decrease with increasing distance to the roads.
For sulphur dioxide, high concentrations might appear for short periodes in areas that are small compared to the areas for which the forecast is presented.