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CO event at a Pennsylvania daycare 11 Oct 2022

"A mysterious carbon monoxide leak at a Pennsylvania daycare sent dozens of children and staff to hospitals Tuesday morning, Allentown officials said. ... The firefighters’ carbon monoxide monitors alerted them to high levels of the odorless, colorless gas...." https://www.cnn.com/2022/10/11/us/allentown-daycare-happy-smiles-carbon-monoxide/index.html

Whatever happened, I did find a recent change which may be relevant. There is a "caboose" behind the building with fuel lines. They burned oil in 2018, gas in 2021.