S Maio1, S Baldacci1, L Cecchi2, G Viegi1,3. 1. Pulmonary Environmental Epidemiology Unit, Institute of Clinical Physiology (IFC), National Research Council, Pisa, Italy. 2. SOS Allergy and Immunology, USL Toscana Centro, Prato, Italy. 3. Institute for Research and Biomedical Innovation (IRIB), National Research Council, Palermo, Italy.