What sign should be posted if formaldehyde levels exceed permissible exposure limits?

• A. Warning: Chemical Hazard
• B. Restricted Access
• C. Danger: Formaldehyde irritant and potential cancer hazard, authorized personnel only
• D. Health and Safety Alert

Answer: (C)

The sign that should be posted if formaldehyde levels exceed permissible exposure limits is one that clearly communicates the specific hazards associated with formaldehyde, including its potential to irritate and its classification as a possible cancer hazard. The phrase "Danger: Formaldehyde irritant and potential cancer hazard, authorized personnel only" encompasses both the immediate risks and the necessary precautions for those entering the area.

This choice is particularly effective because it not only warns of the chemical's irritant properties but also emphasizes the serious nature of the exposure by indicating the potential cancer risk. Furthermore, it restricts access to authorized personnel, thereby ensuring that only those who are trained and equipped to handle such exposures can enter the affected area, which is critical for maintaining safety standards in environments where formaldehyde is used or generated.

By contrast, options that only suggest a general warning or restricted access without specifying the nature of the hazard fail to provide necessary detail. They do not adequately inform individuals of the serious health risks associated with formaldehyde exposure and therefore do not meet the standard for communicating the specific dangers present in that environment.