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LOS ANGELES (AP) — Air quality regulators have cited Southern California Gas Co. for a leak at the Los Angeles storage field where a massive methane release forced thousands from their homes three years ago.

The South Coast Air Quality Management District said Friday that the Aliso Canyon leak created a public nuisance. The agency received 15 complaints of foul odors from residents.

The gas company says Monday’s 50-minute leak wasn’t a health risk.

However, about three dozen people said they suffered problems ranging from nausea to nosebleeds.

Methane detected at Aliso Canyon was more than 30 times the usual concentration.

An October 2014 well leak at Aliso Canyon lasted nearly four months and prompted many health complaints. It was the largest single release of methane in U.S. history.