Grass pollens are most responsible for pollinosis (allergic rhinitis due to pollen) in patients. pollen allergies affect 30 to 35% of adults and about 20% of children from 9 years old.
According to data from federations of allergists, the prevalence of respiratory allergies has tripled in 30 years. The grass season is the longest among pollens since it lasts five months, from May to September. The pollen season is not over for people sensitive to oak, olive or linden pollen.