The chemical can be found in materials including firefighting foam — and the EPA has seemingly delayed a report on it.

Arsenic is a natural component of Earth's crust and highly toxic in its inorganic form. The element is a cause of a global ...

Private wells are especially vulnerable because they are not federally regulated and often go untested, experts say ...

The repeated use of tear gas by federal immigration officers in Chicago has renewed a debate about how chemical irritants ...

The site of the explosion was restricted while under the control of the Bureau of Alcohol, Tobacco, Firearms, and Explosives ...

The U.S. Chemical Safety and Hazard Investigation Board said its team will begin assessing the site now that the ATF has ...