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It now looks like the catastrophic Porter Ranch gas leak, which has spewed more than 83,000 metric tons of noxious methane for nearly three months, has spread across Los Angeles’s San Fernando Valley. On Wednesday, Los Angeles City Councilman Mitchell Englander called on the Southern California Gas Co. to extend residential relocation assistance to residents in Granada Hills, Chatsworth and Northridge who live near the Aliso Canyon gas leak above Porter Ranch. These residents reported symptoms related to the exposure of natural gas such as nausea, vomiting, headaches and respiratory problems.

This latest development compounds with a new analysis from Home Energy Efficiency Team (HEET). The Cambridge-based nonprofit sent Boston University Professor Nathan Phillips and Bob Ackley of Gas Safety to take methane measurements around the San Fernando Valley for several days and their findings were disturbing. As the Los Angeles Daily News wrote, “the researchers recorded elevated levels of the main ingredient in natural gas—10 miles away from the nation’s largest gas leak.” “It’s not just in Porter Ranch, it’s going all the way across the [San Fernando] Valley,” Ackley told Inside Climate News. According to HEET, the researchers drove a high precision GIS-enabled natural gas analyzer down the roads around the gas leak to create a comprehensive map of the leak around San Fernando Valley. The red on the map indicates where they drove and the levels of methane they found is shown by the height of the peaks. Their monitors showed methane levels at 3.4 parts per billion, about twice the level of natural clean air, the Los Angeles Daily News reported. Another measurement showed 127 ppm, or an astounding 67 times above normal. “Whatever else may be in the gas—benzene, toluene, xylene—that is what people may be breathing,” Phillips told Inside Climate News. “Even though we’re not measuring things other than methane, there is a legitimate concern that there is that other nasty stuff in there.”