“…The determination of the pollen season phases is an important goal in aerobiological, agricultural and ecological studies Benninghoff, 1991;Latorre, 1999;Moriondo et al, 2001;Jato et al, 2002aJato et al, , b, 2006Jato et al, , 2007Ribeiro et al, 2007). Thus, several authors have proposed methods to define the pollen season duration or phases such as the start, peak and end date (Nilsson and Persson, 1981;Lejoly-Gabriel and Leuschner, 1983;Andersen, 1991;Spieksma et al, 1995;Jager et al, 1996;Feher and Jarai-Komlodi, 1997;Giorato et al, 2000;Sanchez-Mesa et al, 2003).…”