Which statement is true about Fume Category D?

• A. It indicates acrid, burning rubber, sulfur.
• B. It is associated with musty odors.
• C. It includes bitter aromas.
• D. It covers pleasant fragrances.

Answer: (A)

Fume Category D is defined by an acrid, harsh odor—think of something like burning rubber or sulfur. That sharp, irritating smell is a clue to potentially harmful chemical fumes, which is why this option is the best match for the category.

The other descriptions don’t fit this category. A musty odor points to dampness or mold rather than hazardous fumes. Bitter aromas can occur with some substances, but they don’t typify the acrid, chemical-like profile of Category D. Pleasant fragrances aren’t associated with hazardous cabin fumes and would not indicate Category D hazards.

In practice, detecting an acrid, burning-rubber–like odor would prompt immediate protective actions and adherence to fume exposure procedures to minimize exposure.