With regard to the temporal evolution, the species that contributed
most to theΣPAH in ambient air were Aci in 2004, Phe from 2005 to
2010 and Nap between 2011 and 2014. The Nap contribution to ΣPAH in 2011 was ~44%, being the highest contribution observed for
the eleven years. This higher contribution might have resulted of industrial
processes, such as the manufacturing of dye, plastics and solvents