Grass pollen

Grasses represent a very broad family, growing not only in meadows and fields but also in areas of debris, on cultivated or abandoned soil, or else along the sides of paths; in other words, nearly everywhere from sea level to mountainous areas. Typically, grasses form part of the lawn of any garden. They are responsible for the majority of pollen allergies.

Although the height of pollination is between the months of April, May and June, grass pollens in our country can be detected 10 months out of the year. There is a noticeable relationship between the climate and grass pollination. If the rains are abundant, the pollen concentration in spring is higher.

Weed pollen

Weeds are the type of plants that grow on sand banks, on plains, on the edges of roads and borders of crop fields. The majority of plants that make up this group have their highest pollination in summer, although there are exceptions; parietaria, as well as being the species which causes most allergy, has a long pollination period (from March to October).

Tree pollen

The pollination period of trees is usually short, so patients usually show clinical manifestations only for short periods of time.

Pollination occurs before, during or immediately after the appearance of the leaves, so in moderate climates pollination ends near the end of spring, when the trees are full of leaves. Among the trees with the most allergenic pollens are the olive tree and the willow.