Figure 3From: Mitigation of building-related polychlorinated biphenyls in indoor air of a school Measured concentrations of total PCBs in indoor air of paired rooms before and after increased ventilation; encapsulation of PCB caulk exposed to classrooms; encapsulation of PCB caulk behind unit ventilators, convective heaters, and built-in shelves; and construction of false walls.Back to article page