ATMO Air Quality Representation Index

Color codes and labels of the ATMO index used for the representation of air quality in France. More information on the ATMO index here: <https://www.atmo-france.org/article/lindice-atmo> [](https://www.atmo-france.org/) This index is used in particular in the 3-day air quality data published by Lig'Air for the Centre Region and available here for Orléans Métropole: <https://data.orleans-metropole.fr/explore/dataset/om-santepublique-qualiteair-3j/>