A chlorine gas mask should be provided just outside the chlorine room door.

• A. Just inside the chlorine room door
• B. Just outside the chlorine room door
• C. In the plant superintendent's office
• D. In a locked tamper-proof container

Answer: (B)

Chlorine gas is a highly toxic, fast-acting hazard, so PPE must be immediately accessible where you would need it most in an emergency. Placing the gas mask just outside the chlorine room door puts it in the direct escape path, allowing a worker to quickly don protection as they step out or as they realize a leak is developing. This minimizes exposure time and avoids delays that would occur if the mask were inside the room, inside an office, or kept behind a lock. The doorway location supports rapid protection during a leak or alarm, which is essential for safety in chlorine-handling areas.