Water from Roaring Springs is treated with chlorine to disinfect and to control microbes within it, officials noted.

A chlorine gas leak in the North Rim forced Grand Canyon National Park officials to close three trail heads until further notice.

An emergency situation at the Grand Canyon forced the closure of inner corridor trails, including the Bright Angel Trail, park officials said.

A third-party vendor "offloaded a chemical into the wrong tank," which could have combined with another chemical creating ...

Chlorine gas created by the accidental mixing of chemicals at the Bessborough Hotel at Spadina Crescent and 21st Street in ...

Bright Angel, South Kaibab and North Kaibab trails were all closed. The gas leak was at Roaring Springs, which is the water ...

The Grand Canyon covers 1,904 square miles in Arizona, and is one of the most famous National Parks in the U.S. Nearly 5 million visitors flock to the canyon ea ...

SASKATOON, Sask. — Two people are in hospital after the accidental release of chlorine gas in downtown Saskatoon. Fire crews ...