Pepala lopanda ma carboni popanda pcb (polychlornated bhenyl)

Mu kafukufuku wa 1997, yunivesite ya Florida adapeza kuti maofesi osaneneka omwe amagwiritsa ntchito mapepala ambiri a kateboni anali ndi maula ambiri mlengalenga, pomwe maofesi opumira bwino omwe amagwiritsa ntchito pepala lalitali sanagwiritse ntchito pepala lotere. Phunziroli lidapezanso mitengo yayikulu ya tchuthi odwala ndi matenda m'maofesi omwe amagwiritsa ntchito pepala lambiri la kaboni. Kafukufuku wina, yemwe amafalitsidwa ndi zizolowezi ndi zaumoyo, amawonekera kwambiri ndi fumbi losakhazikika komanso pepala la kaboni poopsa kwa mphumu.