1. Division of Pulmonary Medicine & Alberta Respiratory Centre Department of Medicine University of Alberta Edmonton Alberta Canada
2. Pulmonary Environmental Epidemiology Unit CNR Institute of Clinical Physiology (IFC) Pisa Italy
3. CNR Institute of Translational Pharmacology (IFT) Palermo Italy
4. Department of Biology University of Pisa Pisa Italy
5. Department of Agrifood Production and Environmental Sciences University of Florence Florence Italy
6. Centre of Bioclimatology University of Florence Florence Italy
7. Research Unit Aerobiology and Pollen Information Department of Oto‐Rhino‐Laryngology Medical University of Vienna Vienna Austria
8. Institut Desbrest of Epidemiology and Santé Publique INSERM & Montpellier University Montpellier France
9. Reseau National de Surveillance Aerobiologique (RNSA) Brussieu France