"As eastside families mourn the deaths of four workers at DuPont's La Porte chemical plant in a toxic gas release early Saturday morning, federal investigators are gathering to begin probing for answers."

"Paul Helliker had a job for Dow AgroSciences."

"More than 600 American service members since 2003 have reported to military medical staff members that they believe they were exposed to chemical warfare agents in Iraq, but the Pentagon failed to recognize the scope of the reported cases or offer adequate tracking and treatment to those who may have been injured, defense officials say."

"A group of environmental and public health groups sued the U.S. Food and Drug Administration on Thursday, seeking to set aside the agency's approvals for feed additives containing ractopamine that are used to boost the weight of cattle and pigs."

"The U.S. Food and Drug Administration does not perform enough pesticide residue tests — on either imported or domestic foods – to say whether the American food supply is safe, according to federal auditors."

"An ozone-destroying chemical long thought to be on the decline in Earth’s upper atmosphere is making an unexpected comeback, an international team of scientists has found."

"Veterans who were exposed to toxic contaminants during their service are increasingly becoming casualties in a war with the government -- particularly the Veterans Affairs Department—which they say has a record of delaying and denying benefits promised to them by acts of Congress."

"Minnesota regulators, for the first time, are considering banning or restricting a controversial class of insecticides that have been linked to honeybee deaths."

"Boys exposed in the womb to high levels of a chemical found in vinyl products are born with slightly altered genital development, according to research published today."

"Thirty years after the world’s most dangerous chemical plant disaster, we’re not much safer."