Pollencount by hour

This graph is an example of pollenconcentration during three different types of days. Day 1 shows airborn pollen between 9:00 and 17:00. Day 2 shows a pollenpeak during the early morning hours. Day 3 shows a peak in the evening. Weatherconditions, like a rainshower, a sunny or cloudy day, have big influence on the hourly […]



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 […]

Grasspollen concentration by day

There are several types of grass which release allergenic pollen, like rye, timothy, orchard and bermuda, but also corn pollen can cause problems. You can see in the graph below that the flowering period (in the Netherlands) starts early may and lasts until the end of july. About Grasses Poaceae or Gramineae is a large […]