At what percent of oxygen concentration does significant impairment begin?

Significant impairment begins at an oxygen concentration of 6%. At this level, individuals may experience noticeable physiological effects due to insufficient oxygen for optimal brain and body function. Oxygen concentrations below 6% can lead to confusion, loss of consciousness, and can be life-threatening if exposure is prolonged.

Understanding the context of oxygen concentration is crucial for safety, particularly in emergency situations or hazardous environments where fire brigades operate. The normal atmospheric oxygen concentration is around 21%, and any significant deviation can have serious implications for respiratory health. As oxygen levels drop, the body's ability to function properly diminishes, increasing the risk of accidents and impairments among fire brigade members and others engaged in high-stress or physically demanding tasks.