PCBs are found at high levels in buildings built or remodeled between 1950 and 1978; in caulk used in general construction and window frames, as well as gasket materials in some hvac equipment. PCB levels in excess of 50 ppm are considered by EPA as being unacceptable.
Because PCBs can migrate from the caulk into air, dust, surrounding building materials, and soil, EPA is concerned about potential PCB exposure to building occupants. They issued updated alerts in August, 2010 to confirm their continuing concern.
Health impacts of PC [Read More]
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