Classes resumed Thursday at North Mac Intermediate School, two days after a carbon monoxide leak sickened more than 140 students and adults.
Levels of the odorless gas were at zero Wednesday after repairs to the faulty water heater flue at the intermediate school, Superintendent Marica Cullen wrote on the district’s website. Carbon monoxide detectors were installed and tested in buildings in Girard and Virden.
Experts verified the flue was the source by recreating the problem and monitoring carbon monoxide levels in the building on Tuesday. School officials called students who had sought treatment after the leak Monday and were told that everyone was doing well.
Illinois doesn’t require schools to have carbon monoxide detectors.