What type of fire extinguisher coule create an oxygen defiicient atmosphere?

A fire extinguisher that could create an oxygen-deficient atmosphere is one that uses carbon dioxide (CO2) as the extinguishing agent. When discharged, CO2 displaces oxygen in the environment, potentially lowering oxygen levels below safe thresholds. This can pose a risk to individuals in the area, making it essential to use such extinguishers in well-ventilated spaces or to evacuate the area immediately after use.