Young Post spoke to Dr Kenneth Kwong Si-san, a retired chemistry lecturer at the Chinese University of Hong Kong, about what tear gas is made of, and the effects it can have on a person’s health.

NORTH RIM, Ariz. - Some trails in Grand Canyon National Park are closed because of a chlorine gas leak, according to a post on the park's Facebook page. The leak occurred in the canyon's Roaring ...

GRAND CANYON NATIONAL PARK, Ariz. – A chlorine gas leak at Grand Canyon National Park’s main water supply has forced park officials to close all inner canyon corridor trails. Officials said ...

The incident, caused by a chlorine gas leak from the company's SCL plant, led to symptoms such as breathing difficulties, coughing, and sore throats among the workers, according to officials ...