Wasted sampling gas of CO₂ monitor is another source of air pollution in the operating room

Abstract

It was speculated that waste sampling gas from CO₂ monitor might be another source of air pollution in the operating room.
We measured N₂O concentrations in the operating room when CO₂ monitor was in use.
In the poorly ventilated room, N₂O concentrations reached near 100ppm due to waste gas from CO₂ monitor.
Thus, the waste gas from CO₂ monitor is another source of air pollution in the operating room, and waste gas should be scavenged.