Oxygen-rich air is hazardous because it can ignite or explode more easily. True or False?

• A. True
• B. False
• C. Not specified
• D. It reduces hazard

Answer: (A)

Oxygen concentration directly affects how easily things ignite and how violently they burn. In normal air, about 21% oxygen supports combustion, but when the air is oxygen-rich, flames can ignite more readily, spread faster, and burn more intensely. Oxygen itself isn’t fuel, but it’s the oxidizer that fuels the combustion of any material nearby. Higher oxygen levels lower ignition energy and can cause materials that don’t burn in normal air to ignite or explode more easily. That’s why an oxygen-rich environment is hazardous and why the statement is true. In practical terms, this means avoiding sources of ignition around oxygen-enriched settings and using compatible equipment and procedures to prevent fires or explosions.