What is the only acceptable breathing device to wear while handling chlorine leaks?

The correct answer is the self-contained breathing apparatus (SCBA) because it is specifically designed for situations where there is a risk of exposure to hazardous gases, such as chlorine. SCBAs provide a safe breathing environment by supplying clean air from a tank, isolating the wearer from potentially harmful airborne contaminants.

Chlorine is a highly toxic gas that can cause severe respiratory problems, and it can be present in concentrations that are dangerous to health during leaks. A self-contained breathing apparatus ensures that the operator has a continuous supply of breathable air, which is critical during an emergency response where chlorine may be present in high concentrations.

Other options, such as disposable face masks, full-face respirators, and gas masks, do not offer the same level of protection against the specific risks posed by chlorine leaks. Disposable masks typically do not seal well or filter out gaseous contaminants effectively. Full-face respirators, while better than disposable masks, may not provide a complete air supply in the critical moments of handling a leak. Gas masks are designed for certain chemical exposures but may not be sufficient for high concentrations of chlorine. Therefore, the SCBA is the only breathing device that guarantees safety under these hazardous conditions.