Polychlorinated biphenyls (PCBs) are a group of 209 similar chemicals that used to have widespread applications in industry, particular in electrical equipment such as transformers. PCBs are no longer manufactured, but because they are still found in old electronic equipment, and more importantly, because they persist in the bodies of people and animals and accumulate up the food chain, PCBs are still commonly found in the bodies of people in the United States. PCBs have been associated with neurologic and behavioral problems in children, and with other health effects including cancer, immune dysfunction, and liver and skin disorders. For the Second National Report on Human Exposure to Environmental Chemicals, the categories have been split on the basis of chemical structure into coplanar and non-coplanar PCBs. This is because one mechanism by which PCBs can cause health effects is dependent on whether the chemical molecule is all in the same plane (coplanar) or not. Scorecard provides information on PCBs as a class (including coplanar and non-coplanar). For information on the health effects and industrial releases of PCBs as a class, click on the links below. Information on specific PCB chemicals can be found by clicking on the links below the name of each chemical. CDC's biomonitoring results for PCBs are available at http://www.cdc.gov/exposurereport/polychlorbiphenyl/default.htm.

Health Hazards
Rank Facilities

  • 2,2',3,4,4',5,5'-HEPTACHLOROBIPHENYL (PCB-180)
    Health Hazards
  • 2,2',3,4',5,5',6-HEPTACHLOROBIPHENYL (PCB-187)
    Health Hazards
  • 2,2',3,4',5,5'-HEXACHLOROBIPHENYL (PCB 146)
  • 2 ,3,3',4,4',5'-HEXACHLOROBIPHENYL (PCB 157)
  • 2,3',4,4',5,5'- HEXACHLOROBIPHENYL (PCB 167)
  • 2,2',3,3',4,4',5-HEPTACHLOROBIPHENYL (PCB 170)
  • 2,2',3,3',4,5,5'- HEPTACHLOROBIPHENYL (PCB 172)
  • 2,2',3,3',4',5,6- HEPTACHLOROBIPHENYL (PCB 177)
  • 2,2',3,4,4',5,5'- HEPTACHLOROBIPHENYL (PCB 180)
  • 2,2',3,4,4',5',6- HEPTACHLOROBIPHENYL (PCB 183)