AP:

Hundreds of school buildings across the U.S. have caulk around windows and doors containing potentially cancer-causing PCBs, the Environmental Protection Agency said.
The danger to students is uncertain, and EPA doesn’t know for sure how many schools could be affected. But the agency is telling schools that they should test old caulk and remove it if PCBs turn up in significant amounts.
EPA Administrator Lisa Jackson said PCBs remain in schools and many other buildings built before the chemicals were banned in the late 1970s.
“We’re concerned about the potential risks associated with exposure to these PCBs, and we’re recommending practical, common-sense steps to reduce this exposure as we improve our understanding of the science,” Ms. Jackson said in a news release.