Leaking Methane Plume Spreading Across L.A.'s San Fernando Valley

Inside Climate News: Independent researchers reported detecting elevated methane levels as far as 8 miles from the massive, ongoing leak of natural gas from a storage site in northwestern Los Angeles.

A ruptured well at Southern California Gas Co.'s Aliso Canyon underground facility has spewed more than 80,000 metric tons of methane into the atmosphere since the leak was discovered Oct. 23. The release of the powerful greenhouse gas led to the evacuation of thousands of people from the affluent Porter Ranch neighborhood a mile from the leak after reports by residents of nosebleeds, rashes, headaches and nausea.

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