Environmental

Polychlorinated biphenyls (PCBs) are environmental hazards sometimes found in:

ANatural gas pipelines
BOlder electrical equipment, transformers, and building materials in pre-1979 structures✓ Correct
CFluorescent light tubes in new construction
DResidential water heaters built after 1990

Explanation

PCBs were used in electrical equipment, hydraulic fluids, and building materials (such as caulk) before they were banned in 1979. They are toxic and must be properly managed or removed from properties.

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