Instead, they stuck kids outdoors in 40 degree weather to eat lunch.
We were lucky in the winter if the temperature in the one room school I attended got up to 40 degrees by noon.
Old joke, "the solution to pollution is dilution".
The sheet metal workers' union is probably behind this.
When the NH senate was considering a bill to ban smoking in the workplace, the sheet metal workers' union was the most vocerifous against it, saying instead that more venthillation should be mandated.