What poses a higher risk in an oxygen-deficient atmosphere?

In an oxygen-deficient atmosphere, the physiological effects on the human body are significantly detrimental. One of the most critical consequences of reduced oxygen levels is increased fatigue. When oxygen availability decreases, the body struggles to meet its metabolic demands, leading to symptoms such as tiredness, weakness, and an overall decrease in physical and mental performance. This fatigue can impair decision-making and physical abilities, making it especially dangerous in environments where alertness and physical capability are essential for safety.

While factors like productivity, focus, and comfort may seem appealing or could be superficially associated with different scenarios, they cannot be sustained in an oxygen-deficient environment. Higher productivity and enhanced focus are unlikely outcomes, as fatigue will lead to diminished capability to concentrate and perform tasks efficiently. Similarly, greater comfort is unattainable when the body is experiencing the stress of oxygen deprivation. In this context, understanding the physical hazards posed by an oxygen-deficient atmosphere is crucial for maintaining safety and ensuring well-being in affected environments.