What is the explosion/fire hazard saturated oxygen level?

The explosion and fire hazard oxygen level is recognized as being at 23.5%. In atmospheric conditions, oxygen typically makes up about 20.8% of the air we breathe. When oxygen levels exceed this amount, particularly at or above 23.5%, the risk of combustion and explosions increases significantly. Elevated oxygen environments can cause materials that are normally considered non-flammable to ignite and burn more readily, leading to heightened fire hazards.

In practice, any environment that contains 23.5% oxygen or more requires special monitoring and safety measures to prevent fires and explosions due to the increased potential for combustion. The other levels presented in the options, such as 20.8% (normal atmospheric level), 19.5% (considered a safe lower limit for breathable air), and 16% (which would result in oxygen deficiency), do not represent thresholds associated with explosive hazards.