Great East Area Air Quality Index for the day before and day d up to d+ 3

The Ambient Air Quality Index is a communication tool that provides synthetic information in a simple form (6 colours accompanied by a qualifier) on the level of ambient air pollution, by aggregating data on measured or modeled concentrations of several air pollutants within a public institution for intercommunal cooperation. This index is calculated for one day and for a representative geographical area (common, EPCI). This index shall be calculated in accordance with the provisions of Article 3 of the Decree of 10 July 2020. It is the aggregate result of monitoring five air pollutants: sulphur dioxide “SO2”, nitrogen dioxide ‘NO2’ means ozone ‘O3’, particles with aerodynamic diameter less than 10 micrometers ‘PM10’ and particles with aerodynamic diameter less than 2,5 micrometres ‘PM2.5’. The measurement or modelling of ambient air concentrations representative of a background situation for the pollutants used in the calculation of sub-indexes shall be carried out in accordance with the provisions laid down in the amended Order of 19 April 2017. The index characterising the overall air quality of the day concerned is equal to the most degraded sub-index. It corresponds to a quantified indicator for assessing the state of ambient air quality from “good” to “extremely bad” on a scale of 1 to 6.