M ore than nine years after the Aliso Canyon underground natural gas storage facility in the San Fernando Valley became the site of the largest methane leak in U.S. history, a state commission on ...

The 2015 Aliso Canyon gas leak, which took four months to control, released more than 120,000 metric tons of methane and other gases into the atmosphere over communities in the San Fernando Valley.

The Grand Canyon's three Inner Corridor trails had to be shut after workers discovered dangerous chlorine gas at the Roaring Springs waterfall ...