Increased CO(2) levels in the operating room correlate with the number of healthcare workers present: an imperative for intentional crowd control

The air in an operating room becomes more contaminated as the occupancy of the room increases. Individuals residing in a room can potentially emit infectious agents. In order to inhibit and better understand the epidemiology of surgical site infections, it is important to develop procedures to track room occupancy level and respiration. Exhaled CO(2) provides a respiratory byproduct that can be tracked with IR light and is associated with human occupancy. Exhaled CO(2) can also be used as an indirect measure of the potential release and level of infectious airborne agents. We show that non-dispersive infrared CO(2) sensors can be used to detect CO(2) in operating room air flow conditions of 20 air changes per hour and a positive pressure of 0.03 in. H(2)O. The CO(2) concentration increased consecutively for occupation levels of one to four individuals, from approximately 65 ppm above the background level when one individual occupied the operating room for twenty minutes to approximately 300 ppm above the background when four individuals were present for twenty minutes. The amount of CO(2) detected increases as the number of occupants increase, the activity level increases, the residency time increases and when the ventilation level is reduced. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s13037-022-00343-8.