"Senior U.S. health officials have squelched a Food and Drug Administration proposal that for the first time would have curbed dentists’ use of mercury – one of the planet’s nastiest toxins because it attacks the central nervous system – in treating Americans’ decayed teeth."

"Microscopic bugs and mildew can destroy a marijuana operation faster than any police raid. And because the crop has been illegal for so long, neither growers nor scientists have any reliable research to help fight the infestations."

"Will the bills seeking to amend the Toxic Substances Control Act really protect Americans?"

"Before Freddie Gray died of spinal injuries he received in police custody, sparking weeks of protest in his native Baltimore and around the country, he was a 'lead kid,' one of thousands of children in the city with toxic levels of lead in their blood from years of living in substandard housing -- and long-term health problems as a result."

"Federal officials this week labeled DuPont Co. a “severe violator” of worker safety rules, after uncovering more safety problems in an investigation launched following a massive toxic gas leak that killed four workers at the company’s La Porte, Texas, plant last November."

"A St. Louis County jury has found that Monsanto is not liable in a series of deaths and illnesses suffered by people who were exposed to the PCBs manufactured by the company until the late 1970s."

"The tiny federal agency that has urged big reforms in how California regulates oil refineries is in disarray."

"A CSX train car carrying hazardous material derailed and caught fire in the middle of the night in eastern Tennessee, forcing the evacuation of thousands of people and sending dozens to the hospital with respiratory issues and nausea."

"The Obama administration moved Thursday to restrict the use of hydrofluorocarbons (HFCs), the most potent greenhouse gases emitted by human activity."

"A helicopter pilot who repeatedly flew over Curry County homes while spraying herbicides on clear cuts in 2013, drawing 20 complaints of illness, will not face any monetary fine from the state."