Environmental

Polychlorinated biphenyls (PCBs) found in older transformers and electrical equipment on commercial properties are considered hazardous because:

AThey emit radon gas
BThey are toxic, persistent organic pollutants that do not break down in the environment✓ Correct
CThey cause mold growth
DThey contaminate only surface water

Explanation

PCBs are highly toxic synthetic chemicals that were widely used before being banned in 1979. They are persistent in the environment, bioaccumulate in food chains, and are associated with cancer and other health effects. Their presence on a property creates serious environmental liability.

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