About Ambrosia Ragweeds are flowering plants in the genus Ambrosia in the aster family, Asteraceae. They are distributed in the tropical and subtropical regions of the New World, especially North America, where the origin and center of diversity of the genus are in the southwestern United States and northwestern Mexico. Several species have been introduced […]
This graph shows data of three sample days. Instead of counting all pollen during one day, the pollen were counted every hour. This results often in interesting insights of pollenconcentrations during the day. In this case you can see peaks during morning, afternoon and evening. Mainly based on different weatherconditions.
The Birch is not the first trees in the season which flowers, but it has highly allergenic pollen. Although there is a flowering-calendar which indicates the usual period of flowering, you can see in the graph this can vary a lot. In 2017 there was a birchpollen peak (in the Netherlands) at the end of […]