At what percentage of oxygen concentration does impairment typically occur?

Impairment in human cognitive and physical functions typically occurs at an oxygen concentration of around 17%. At this level, individuals may begin to experience symptoms such as diminished coordination, impaired judgment, and decreased ability to perform tasks that require careful thought or physical agility.

As oxygen levels drop below the normal atmospheric concentration of approximately 21%, the body struggles to operate effectively. At concentrations around 17%, the brain and other vital organs do not receive the oxygen they require to function optimally, leading to noticeable impairment. This is particularly important to understand in the context of fire safety and emergency situations, as team members must be aware of their environment and potential hazards related to oxygen levels.

Recognizing these critical thresholds helps facility fire brigade members make informed decisions about their safety and the safety of others in emergency situations.