Environmental

In Colorado, 'Polychlorinated Biphenyls' (PCBs) are hazardous substances found in:

AA. Modern insulation materials
BB. Old electrical equipment (transformers, capacitors), older building materials, and caulks in buildings constructed before 1980✓ Correct
CC. Only industrial manufacturing facilities
DD. New construction materials produced after 2000

Explanation

PCBs were widely used in electrical equipment (transformers, capacitors) and some building materials (caulks, paints) before being banned in the U.S. in 1979. They are classified as probable carcinogens. In older commercial buildings and schools, PCB-containing caulk and window glazing may require special handling and disposal.

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