Environmental

In New Mexico, polychlorinated biphenyls (PCBs) are an environmental concern primarily in:

AAll water sources
BOlder commercial buildings with electrical equipment containing PCB-based transformer oil✓ Correct
CAll residential properties
DNew construction only

Explanation

PCBs were widely used in electrical transformers and other equipment before their banning in 1979. Older commercial buildings may contain PCB-contaminated equipment or soil from transformer leaks.

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