"The U.S. Environmental Protection Agency and New York City announced a pilot program Tuesday to address the problem of potentially hazardous PCBs in construction materials in some city schools."

"Oil and gas operators are skirting federal law when they inject toxic 'fracking fluids' into wells, threatening drinking water supplies from Pennsylvania to Wyoming, according to a new report by the Washington-based Environmental Working Group."

"Exxon Mobil Corp., the largest U.S. energy company, 'knew or should have known' that drilling pipes it sent to a Louisiana pipe yard were contaminated with dangerous radioactive material, a witness testified in court."

"A month after environmental groups alleged that an Eastern Shore chicken farm was polluting a Chesapeake Bay tributary, state regulators have yet to test the fouled waterway or the pile of sewage sludge said to be contaminating it, officials have acknowledged."

"Nearly five years after fly ash and other debris flowed down Rostosky Ridge Road in Forward Township [Pa.], work was expected to begin to remove the final remains of that slide."

"Joliet is pushing the Illinois Environmental Protection Agency to more than double the concentration of cancer-causing radium it's allowed to dump onto farmland in the south suburbs, expanding the potential for deadly radon gas in these increasingly urban communities."