Mariella Aquilino, Marica De Lucia, Sabino Maggi, Silvana Fuina, Cristina Tarantino, Francesco Carbone, Nicola Pirrone, Institute of Atmospheric Pollution Research – National Research Council (IIA-CNR), Italy; Roberto Bellotti, Alfonso Monaco, Roberto Cilli, Alessandro Fania, Ester Pantaleo, Interateneo Physics Department “M. Merlin”, University of Bari, Italy; Vincenzo Campanaro, Francesca Intini, Angela Morabito, Alessandra Nocioni, Ilenia Schipa, Annalisa Tanzarella, Regional Environmental Protection Agency, Bari, Italy; Maria Adamo, Institute of Atmospheric Pollution Research – National Research Council (IIA-CNR), Italy