ATMO pollen index - Pollen index

The pollen index is a synthetic daily indicator calculated by the approved air quality monitoring associations (AASQA) that describes pollen events at municipal level. The pollen index takes into account the concentrations of six species/taxons: alder, birch, olive, sagebrush, grasses and ambrosia. Each level of concentration reached by each taxon is assigned a sub-index (very low, low, moderate, high, very high, extremely high, unavailable). The pollen index is the highest sub-index. The pollen index is updated daily for the current day, the next day and the day after tomorrow. Data source: Atmo France and the approved air quality monitoring associations Additional information: [https://www.atmo-france.org/sites/federation/files/medias/documents/2025-04/Presentation _index_pollen_version_2_April_2025.pdf)](https://www.atmo-france.org/sites/federation/files/medias/documents/2025-04/Presentation _index_pollen _version _2_April_2025.pdf)