What is the maximum recommended CO2 limit for emergency situations?

In hyperbaric medicine, the management of carbon dioxide (CO2) levels is critical, particularly in emergency situations where divers may be subject to increased physiological stress. The maximum recommended CO2 limit for emergency scenarios is 1.5%. This threshold recognizes that elevated CO2 levels can lead to respiratory acidosis and an increased risk of hypercapnia, which can impair cognitive function and physical capability. Maintaining CO2 levels below this limit is vital for ensuring the safety and performance of personnel in high-pressure environments. By setting the limit at 1.5%, it allows for emergency flexibility while minimizing physiological risks associated with higher concentrations of carbon dioxide.