What is the definition of an oxygen deficient atmosphere?

An oxygen deficient atmosphere is defined as one that contains less than 19.5 percent oxygen. This threshold is critical because oxygen levels below this percentage can lead to physiological effects, including impaired cognitive function, increased heart rate, and even loss of consciousness. The Occupational Safety and Health Administration (OSHA) and other safety standards recognize this level as the minimum required for safe breathing in various environments, especially in high hazard facilities.

The categorization of an atmosphere as oxygen deficient emphasizes the importance of maintaining a safe working environment where the oxygen content is at or above this level, ensuring the health and safety of personnel. Therefore, the definition not only establishes a clear guideline for acceptable oxygen levels but also serves as a basis for implementing safety protocols to prevent risks associated with low oxygen environments.