“…To execute the PMF in order to calculate the PMF-factors, we used 20 iterations by using a number of 6 contributing factors, expecting contributions from waste incineration, steel production, forest fire, coal burning and heating, traffic, and one undefined source. Congener patterns of the calculated PMF-factors were compared with congener patterns from the literature to estimate the contribution from different sources (Alcock et al, 1998;Aristiz� abal et al, 2011;Castro-Jim� enez et al, 2008;Colombo et al, 2009;Colombo et al, 2013;Coutinho et al, 2015;Denys et al, 2012;Gullett and Touati, 2003;Gunes and Saral, 2014;Hagenmaier et al, 1994;Li et al, 2010;Lin et al, 2007;Mosca et al, 2012;Wang et al, 2013). If no clear pattern could be distinguished for PMF-factors, the unclear PMF-factors were merged into one which we depicted "undefined".…”