EtO is a toxic, invisible gas that the Environmental Protection Agency classified as a carcinogen nearly a decade ago. It’s ...

This map depicts H2S concentrations measured on each oil and gas lease, not at the location of every well. It also does not depict whether, or where, any leaks are occurring or have occurred.

There are about 90 sterilizing plants in the U.S. that use a cancer-causing gas called ethylene oxide. Some say new proposed regulations don't go far enough.