Vapors that attack mucous membranes, such as those of the eyes, nose, and throat, are considered which hazard category?

• A. Asphyxiants
• B. Irritants
• C. Anesthetics
• D. Carcinogens

Answer: (B)

Vapors that irritate mucous membranes cause local irritation of tissues like the eyes, nose, and throat. This is how the hazard is classified: the primary danger from these vapors is their ability to inflame and irritate the mucous membranes, rather than displacing oxygen, depressing the nervous system, or causing long-term cancer risk. That’s why they fall into the irritants category.

Asphyxiants mainly impair oxygen delivery and can cause dizziness or unconsciousness without targeting the mucous membranes. Anesthetics act on the nervous system to blunt sensation or consciousness, not primarily by irritating the mucous membranes. Carcinogens pose long-term cancer risks with sustained exposure rather than immediate mucous membrane irritation.