Environmental

PCBs (polychlorinated biphenyls) are found in real estate primarily in:

AFreshly poured concrete foundations
BOlder electrical transformers, caulking, and some building materials✓ Correct
CModern HVAC systems
DRadon mitigation equipment

Explanation

PCBs were widely used in electrical transformers, capacitors, caulking compounds, and some older building materials. They are a known carcinogen and environmental contaminant regulated under TSCA.

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