A published statement by 145 scientists from 22 countries expresses new worries about the health effects of flame retardants used in mattres

Vast amounts shipped overseas, used at home

How a rare kidney disease is killing laborers and vexing researchers in three countries.

PART ONE: An EPA panel appointed to study hexavalent chromium included scientists who had consulted for industry in lawsuits.

Gas shortage prompts helium balloon company to hire help as Valentine's Day nears.

Across the country, residents are challenging the health impact of coal ash ponds -- bringing lawsuits as EPA delays new rules.

Tens of millions of Americans drink tap water tainted with chromium. But industry pushback has made it hard for the EPA to regulate.

Investigation pushes EPA to change policies

Knight Science Journalism at MIT commends Center and PBS for reporting on toxic cleanup in California