Classrooms and Ozone Generators
Whatever the case may be, odors in classrooms are not welcome by any means and must be dealt with appropriately. Chemicals could be used in this case, but could also be harmful.
Whoever arrives first in the morning should turn the unit off and put it away, and open one of the windows in the room where the unit was running all night. The vents should be tapped over while the unit is running, so the cycle does not circulate into other rooms. Once the room has had a chance to air out, you will be able to tell whether or not the odor is completely gone. If it is still there, run the cycle for another night.