Environmental
Polychlorinated biphenyls (PCBs) are a concern in real estate primarily because they were used in:
ALead-based paints manufactured before 1978
BElectrical transformers and some construction materials (like caulk) before being banned in 1979✓ Correct
CAsbestos insulation products
DRadon mitigation systems
Explanation
PCBs were widely used in electrical transformers and capacitors and in some building materials like caulk before being banned in 1979 under the Toxic Substances Control Act (TSCA). PCBs are toxic, persistent, and are classified as probable carcinogens. Older commercial and industrial buildings may contain PCB-laden caulk or other materials.
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