Which of the following indicates a TIH even if a label is missing?

• A. A bright colored placard indicates TIH.
• B. Strong, unusual odor; visible venting or hissing; or detection by specialized hazmat monitors.
• C. A vague feeling of warmth on the container indicates TIH.
• D. The absence of a label means TIH cannot be detected.

Answer: (B)

When a label might be missing, you rely on observable signs and detection equipment to identify a toxic inhalation hazard. A strong, unusual odor can signal the release of toxic gas, visible venting or hissing shows that the container is actively releasing contents, and specialized hazmat monitors can detect TIH gases even without labels. These cues work together because they don’t depend on labeling being present—odors and venting provide immediate physical signals, while detectors give objective confirmation.

Relying on a bright placard assumes the label is there and legible, which isn’t guaranteed. A vague feeling of warmth is not a dependable or specific indicator of TIH, and saying TIH can’t be detected without a label is false because odor, venting, and detector readings can reveal the hazard even when labeling is missing.