A leaking gas well near the US city of Los Angeles which has been polluting the air for four months has been “permanently sealed,” officials say. The Southern California Gas Company (SoCal Gas) had been pumping in heavy fluids and cement to seal the well. The leak began in October in a vast underground storage field in Porter Ranch, on the outskirts of Los Angeles. The gas leak, one of the largest in American history, has caused thousands to relocate to temporary housing. At its height, the escaping gas at the Aliso Canyon storage field accounted for a quarter of all methane emissions – an extremely potent greenhouse gas – across the entire state of California. ‘Much work to do’ “We are pleased that DOGGR [the Division of Oil and Gas] has confirmed that […]