Environmental

In South Dakota, the primary concern with 'polychlorinated biphenyls' (PCBs) in older commercial buildings is:

APCBs increase fire risk in electrical systems
BPCBs are toxic chemicals used in electrical equipment and insulation before 1979 that require special handling during renovation or demolition✓ Correct
CPCBs cause structural damage to foundations
DPCBs only affect outdoor soil, not building materials

Explanation

PCBs were widely used in electrical transformers, fluorescent light ballasts, and other equipment before being banned in 1979. They are toxic and persistent environmental contaminants.

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