What is the permissible exposure limit for hydrogen chloride (HCL)?

What is the permissible exposure limit for hydrogen chloride (HCL)?

• A. 0.5 PPM
• B. 5 PPM
• C. 10 PPM
• D. 50 PPM

Answer: (B)

Permissible exposure limit is the level of exposure considered safe for workers over a standard work shift. For hydrogen chloride, the PEL is 5 parts per million as an 8-hour time-weighted average. This value reflects the gas’s highly irritating and corrosive nature; even moderate exposures can irritate the eyes, nose, and throat, and longer exposures raise the risk of tissue damage. Setting the limit at 5 ppm provides protection for typical shift durations while allowing industrial work to continue with proper controls. Exposures at higher levels would exceed the limit and increase the likelihood of irritation and injury.

Permissible exposure limit is the level of exposure considered safe for workers over a standard work shift. For hydrogen chloride, the PEL is 5 parts per million as an 8-hour time-weighted average. This value reflects the gas’s highly irritating and corrosive nature; even moderate exposures can irritate the eyes, nose, and throat, and longer exposures raise the risk of tissue damage. Setting the limit at 5 ppm provides protection for typical shift durations while allowing industrial work to continue with proper controls. Exposures at higher levels would exceed the limit and increase the likelihood of irritation and injury.