UV exposure on a ski-field at an Alpine site AM. Siani, G.R. Casale, Sapienza - University of Rome, Dept. of Physics, Rome, Italy H. Diémoz, G. Agnesod, ARPA Valle d'Aosta (Aosta Valley Regional Environmental Protection Agency), Saint-Christophe (Aosta), Italy M. G. Kimlin, C.A. Lang, Australian Sun and Health Research Laboratory, Queensland University of Technology, Institute of Health and Biomedical Innovation, Brisbane, Australia M. Borra, A. Militello, ISPESL, (Italian National Institute of Occupational Safety and Prevention), Occupational Hygiene Dept., Monteporzio Catone (Rome) Italy A. Colosimo Sapienza - University of Rome, Dept. of Human Physiology and Pharmacology ,Rome, Italy