What is a common hazard encountered at a confined space incident?

A common hazard encountered at a confined space incident is an oxygen-deficient atmosphere. Confined spaces, such as tanks, silos, or tunnels, often have limited ventilation, which can lead to a decrease in oxygen levels. This situation can arise due to natural processes like the consumption of oxygen by bacteria or other reactions occurring within the space or the presence of materials that displace oxygen. Working in an atmosphere with insufficient oxygen can lead to serious health risks, including unconsciousness or even death, making it crucial for responders to monitor oxygen levels before entering a confined space.

While other hazards, such as high toxicity, flammable vapors, and electrical hazards, can also be present in confined spaces, the oxygen-deficient atmosphere is particularly concerning since it poses an immediate threat to life, necessitating vigilant atmospheric monitoring and protective measures during rescue or recovery operations.