Dr. Markus BergerHead of the Austrian Pollen Information Service © Foto Wilke
Allergy or cold information sheetRecognizing the difference © screencode GmbH
Purple alder© Johannes Bouchal
Purple alder© Johannes Bouchal
Purple alder© Johannes Bouchal
Ragweedmarkus Berger
Ragweedmarkus Berger
Ragweedmarkus Berger
House dust mite© iStock