Why is it particularly important to check for oxygen levels in confined spaces prior to entry?

Checking for oxygen levels in confined spaces prior to entry is crucial because oxygen deficiency can lead to serious health risks. In confined spaces, the usual atmosphere can be altered due to several factors, such as the presence of chemicals, biological agents, or even the activity taking place within the space, which may consume the available oxygen. When the oxygen level drops below safe thresholds, individuals may experience symptoms of hypoxia, such as dizziness, confusion, and loss of consciousness, which can result in severe health consequences or even fatalities.

Ensuring adequate oxygen levels is part of maintaining a safe work environment and is mandated by safety protocols and regulations when working in enclosed or poorly ventilated areas. This precaution helps protect workers from potentially life-threatening situations.