Craig Galanti was standing in a Costco aisle earlier this month when his phone buzzed with an alert: unusually high levels of methane gas had been detected near his Porter Ranch neighborhood overlooking the San Fernando Valley. The level recorded was 249 parts per million, more than 100 times what’s normally found in the air.

The message, sent Oct. 3, just a few weeks shy of the 10-year anniversary of the Aliso Canyon gas leak on October 23, 2015, came from the Porter Ranch Community Air Monitoring Project — an independent system set up after the 2015 Aliso Canyon blowout to give residents real-time data.

Galanti immediately texted his wife: “Do not go home yet.”

“Your anxiety level goes up significantly,” he said. “ You want to understand immediately as much as you possibly can, so y

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