Last night’s snowstorm may not have closed down New York City public schools, but most of the kids at P.S. 36 in Staten Island will be kept home by their parents, anyway, while the Department of Education sorts out a toxic mess, reports ParentDish. Last week, potentially dangerous levels of polychlorinated biphenyls (PCBs), a known carcinogenic chemical, were found inside the school as a result of leaking fluorescent light fixtures. Banned in 1979 by the U.S. Environmental Protection Agency (EPA), PCBs are now listed in the top 10 percent of the EPA’s most toxic chemicals. But, despite the ban, products made with PCBs still may be present in older buildings, typically in fluorescent lights and caulking…