Naletsana

a Li-PCB (li-polychlorinated biphenyl) tse ’nileng tsa sebelisoa ka ho pharaletseng ho tloha ka bo-1930, ke sehlopha sa metsoako e ka holimo ho 200 e nang le oli e sebelisoang linthong tse ngobetsang, lipolasetiking, ho aroleng lithapo tsa motlakase, chefong e bolaeang likokoanyana, sesepeng se metsi se hlatsoang lijana le lihlahisoeng tse ling. Le hoja hona joale ho hlahisoa ha PCB ho thibetsoe linaheng tse ngata, ho ’nile ha hlahisoa tse lipakeng tsa milione le limilione tse peli. Ho bile le liphello tse kotsi ka lebaka la li-PCB tse lahliloeng tse ileng tsa fetela tikolohong.