In the UK most air pollution information services use the index and banding system approved by the Committee on Medical Effects of Air Pollution Episodes (COMEAP). The system uses 1-10 index divided into four bands to provide more detail about air pollution levels in a simple way, similar to the sun index or pollen index.
The overall air pollution index for a site or region is calculated from the highest concentration of five pollutants:
Air Quality Forecasts are issued on a regional basis for three different area types:
Forecasts are based on the prediction of air pollution index for the worst-case of the five pollutants listed above, for each region.