Environmental

Polychlorinated biphenyls (PCBs) found in older Maryland commercial buildings are a concern because they:

ACause radon gas emission
BAre toxic, probable human carcinogens used in electrical equipment and building materials before being banned✓ Correct
CAre only harmful if ingested in drinking water
DCan only be found in flooring materials

Explanation

PCBs are toxic industrial chemicals that were widely used in electrical transformers and building caulk before being banned. Their presence requires specialized cleanup and disclosure.

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