A local high school has reopened its pool following a carbon monoxide scare earlier this month, Local 4 reported.

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Officials at Royal Oak Dondero High School had a pool heater repaired after it was discovered it was leaking carbon monoxide.

The leak caused the evacuation of several people during a Saturday swimming lesson at the school.

More than 30 children and adults were treated for carbon monoxide poisoning.

Of the 35 patients seen by doctors at William Beaumont Hospital, six had high levels of carbon monoxide that required placement in a hyperbaric chamber, said Dr. Frank McGeorge, director of emergency medicine at Beaumont.

Testing by the fire department indicated that the carbon monoxide levels in the pool area were near 500 parts per million, Local 4 reported. The station learned that the level at which the gas is considered to be dangerous is 32 parts per million.

The school has installed carbon monoxide detectors to trace the levels of the gas and prevent any further incidents from occurring.