FDEP Drinking Water Operator C Practice Exam

The safe oxygen level in confined spaces is generally considered to be within a range of 19% to 23%. Oxygen levels below 19% can lead to impaired physical and cognitive functions and can pose serious health risks, including unconsciousness and death. Conversely, oxygen levels above 23% can increase the risk of fire and explosiveness, especially in environments where flammable materials are present.

Maintaining an oxygen level within the 19% to 23% range ensures that workers have sufficient oxygen for normal physiological functions while minimizing the risks associated with both low and high concentrations. This range is established through guidelines from organizations such as the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH), which focus on ensuring safety in potentially hazardous environments, including confined spaces.