Heptachlorobiphenyl

Legacy PCB mixtures (Aroclors) in old transformers/capacitors, caulk/paint (pre-1979), contaminated soils/sediments, and waste sites; it accumulates in fish and wildlife [1][2][3].

Eating contaminated fish/seafood, meat, or dairy; breathing indoor air/dust in older buildings; contact during electrical work or renovation; transfer during pregnancy and breastfeeding [1][2][4].

PCBs cause cancer in humans and can affect the immune system, thyroid and liver, and children’s brain development, especially with prenatal/early-life exposure [1][3][5][6].

People who frequently eat contaminated sport-caught fish, workers handling old electrical gear or doing demolition/renovation, residents near PCB sites, pregnant people, infants, and young children [1][2][3].

Follow local fish advisories; trim fat/skin and cook so fat drips away; reduce dust (HEPA vacuum, wet-wipe); avoid sanding old caulk; use protective gear and hygiene at work; seek professional PCB abatement [1][2].