Even though polychlorinated biphenyls (PCBs) have not been manufactured in the U.S. for over forty years, they continue to be present in building materials, including in caulk and joint materials, ...

Millions of fluorescent light ballasts containing PCBs probably remain in schools and day care centers across the U.S. four decades after the chemicals were banned over concerns that they could cause ...

Millions of fluorescent light ballasts containing PCBs probably remain in schools and day care centers across the U.S. four decades after the chemicals were banned over concerns that they could cause ...

This combination of images from April 28, 2014, and July 15, 2016, respectively, and provided by teacher Cynthia Yost, shows black residue from a failed fluorescent light ballast, left, and a carpet ...