“…However, the PCB levels measured in spruce/pine needles, a widely employed bioindicator with cuticular wax, are worth mentioning. The concentrations were generally low (<1 ng/g) for measured individual congeners at remote sites (PCB-28, 52, 101, 138, 153, and 180;Klánová et al 2009) and in a background area in Czech Republic (PCB-28, 52, and 101; Holoubek et al 2000), in Dalian, China (summation of PCBs with the same degree of chlorination; Chen et al 2006) and in Zagreb, Croatia (17 of 20 PCB congeners; Kožul and Romanić 2008). The concentrations were generally >1 ng/g for PCB-28, 52, and 60 in Zagreb, Croatia (Kožul and Romanić 2008), and for 52,60,74,101,138, and 153 along the Adriatic coast, Croatia (Romanić and Klinčić 2012); up to 50 ng/g for total PCBs in heavily industrialized and populated areas of Poland (Falandysz et al 2012;Wyrzykowska et al 2007); up to 270 ng/g with an average of 93 ng/g for Σ 15 PCBs in Beijing, China (Xu et al 2004); and up to 128 ng/g for total PCBs around a hazardous waste incinerator in Canada (Blais et al 2003).…”