Asphyxiation is primarily caused by which of the following?

• A. Toxic accumulation of gases
• B. Oxygen deficiency
• C. Mechanical obstruction of airways
• D. Psychological distress

Answer: (B)

Oxygen deficiency is the primary cause of asphyxiation because it relates directly to the amount of oxygen available for breathing. When there is insufficient oxygen in the environment—whether due to displacement by other gases, such as in enclosed or poorly ventilated spaces, or because of environmental conditions—individuals cannot inhale enough oxygen to sustain normal bodily functions. This lack of oxygen leads to cellular damage and can ultimately result in loss of consciousness and death if not addressed promptly.

While toxic gas accumulation can contribute to limiting oxygen availability or have harmful effects, and mechanical obstruction certainly prevents airflow, these are not the fundamental mechanisms that define asphyxiation. Psychological distress, though it can impact breathing, is not a direct physical cause of asphyxiation. Understanding these distinctions is crucial for effectively identifying and responding to asphyxiation risks in hazardous material situations.