Polychlorinated biphenyls (PCBs) were until the 90s as insulating agents in old capacitors, fluorescent lamps, household appliances, paints, plastics and plasticizers. They continue to pose a health risk today. In many cases, old devices such as fluorescent tubes with PCB-contaminated small capacitors are still in use. The harmful PCB-contaminated insulating fluid can leak out of these.
