Pollen calendars for Switzerland, for selected regions and for all monitoring stations. Pollen calendars show the average year-round profile of the pollen season for the major allergenic pollen types, and provide an overview of which pollen types are present when, during the course of the year. The pollen calendars are only shown up to 2022, as the method for measuring pollen was changed from 2023. The new, automatically measured pollen data differs from the previous, manually measured data. The pollen calendars will be updated as soon as the data series are homogenised at the transition to automatic measurement.