"The U.S. environmental regulator argued in court on Tuesday that its rule limiting mercury and hazardous air pollutants is 'appropriate and necessary,' not an improper interpretation of the federal Clean Air Act as industry groups and some states contend."

"Traces of 18 unregulated chemicals were found in drinking water from more than one-third of U.S. water utilities in a nationwide sampling, according to new, unpublished research by federal scientists. Included are 11 perfluorinated chemicals, an herbicide, two solvents, caffeine, an antibacterial compound, a metal and an antidepressant."

"Every time you wash your hair, a lot of shampoo goes down the drain. And if you're bothered by tiny white flakes, odds are you use a shampoo that deals with dandruff."

After 4 railcars plunged into a creek a year ago near Paulsboro, N.J., spilling vinyl chloride, the effects are still being felt by local residents.

"Scio Township resident Roger Rayle is beginning his 21st year as a citizen volunteer watching over the issue of the expanding Pall-Gelman 1,4-dioxane plume."

A new California rule may herald the end of toxic flame-retardant chemicals in furniture.

"Only about half of the prescription drugs and other newly emerging contaminants in sewage are removed by treatment plants."

"The U.S. Department of Justice filed a motion in federal court Wednesday asking a judge to dismiss a lawsuit alleging the Environmental Protection Agency has failed to follow through on upholding an environmental justice pledge."