1. a Laboratory of Meteorology , University of Athens , Panepistimioupolis, PHYS‐V, Athens 157 84, Greece
2. b Red Cross Hospital , Eye Clinic B , 1 Erythrou Stavrou Str., 115 26 Athens, Greece
3. c Ozone and Solar Ultraviolet Radiation Research Team , Faculty of Physics , University of Athens , Panepistimiopolis, Athens 157 84, Greece