"CHARLESTON, W.Va. -- Obama administration officials on Friday proposed to update the federal government's 42-year-old exposure limits for silica dust, a move the Labor Department said would prevent 700 deaths and 1,600 new cases of silicosis every year. The proposal would provide new protections for 2.2 million American workers, cutting in half the legal limit for dust exposure on the job."

"California public health officials suggest limiting hexavalent chromium in drinking water to 10 parts per billion. Environmentalists say that's not nearly strict enough."

"As evidence mounts that excessive use of light is harming wildlife and adversely affecting human health, new initiatives in France and elsewhere are seeking to turn down the lights that flood an ever-growing part of the planet."

"WASHINGTON -- New Environmental Protection Agency chief Gina McCarthy plans to visit the site of Alaska’s proposed Pebble Mine next week as she decides whether to block the massive project to protect one of the world’s last big runs of wild salmon."

"An advisory panel to Tokyo Electric Power Co. urged the utility to tighten water-management procedures at its crippled Fukushima Dai-Ichi plant weeks before 300 metric tons of radioactive water seeped out, the panel’s chairman said."

"Residents have complained for years about thick black smoke and possible pollution coming from the MarkWest gas plant in Chartiers. But the state Department of Environmental Protection said it couldn't take action because it had no evidence. On Tuesday, the department said it had the goods."

"Quebec's government last week added rail giant Canadian Pacific Railway Corp. to its list of companies deemed responsible for cleanup costs following last month's deadly oil train derailment."

"ROCKAWAY BEACH, Ore. -- From her front porch, Nancy Webster has a clear view of the hills just east of the coast highway, a western hemlock forest that's home to Rockaway Beach's water supply."

"Japan will raise the severity rating of a recent toxic water leak at the destroyed Fukushima nuclear plant to level 3, or 'serious incident', on an international scale for radiological releases, underlining the deepening sense of crisis at the site."