Environmental

In New Mexico, 'polychlorinated biphenyls' (PCBs) may be found in older commercial and industrial properties in:

AAsphalt shingles
BElectrical transformers, fluorescent light ballasts, and older caulking materials✓ Correct
CWood framing
DCopper plumbing

Explanation

PCBs were widely used in electrical equipment (transformers, capacitors), fluorescent light ballasts manufactured before 1979, and some caulking and paint. They are probable human carcinogens and regulated under TSCA and CERCLA.

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