A change from grass pollen induced allergy to tree pollen induced allergy: 30 years of pollen observation in Switzerland

摘要: Pollen monitoring with a Hirst like pollen trap for 30 years in Basel, Switzerland allows understanding of the behaviour different plants producing allergenic pollens. It becomes evident that this time period tree Hazel and Birch increased, whereas control, observed amount herb Artemisa did not change. Moreover, it was trees flowering took place earlier namely at beginning year. This especially impressive Hazel, where shifted ofmore than one month.