If oxygen level rises above 23.5%, what is the hazard?

If oxygen level rises above 23.5%, what is the hazard?

• A. Explosive
• B. Non-reactive
• C. Corrosive
• D. Reduced oxygen level

Answer: (A)

When oxygen is enriched above the normal atmospheric level, the fire risk rises dramatically. Oxygen supports and speeds combustion, so once O2 is around 23.5% or higher, many materials that don’t ignite in air can catch fire, burn more fiercely, or even explode if a fuel and an ignition source are present. That heightened fire/explosion danger is why the correct choice is the explosive hazard. It isn’t about being non-reactive or corrosive, and a reduced oxygen level would create a different hazard (hypoxia) rather than the ignition risk seen with enriched oxygen.

When oxygen is enriched above the normal atmospheric level, the fire risk rises dramatically. Oxygen supports and speeds combustion, so once O2 is around 23.5% or higher, many materials that don’t ignite in air can catch fire, burn more fiercely, or even explode if a fuel and an ignition source are present. That heightened fire/explosion danger is why the correct choice is the explosive hazard. It isn’t about being non-reactive or corrosive, and a reduced oxygen level would create a different hazard (hypoxia) rather than the ignition risk seen with enriched oxygen.