What does TIH stand for and how is it indicated in hazmat classification?

• A. Toxic Ingestion Hazard; indicated by ingestion toxicity.
• B. Toxic Inhalation Hazard; indicated by labeling that is not part of hazmat class.
• C. Thermal Inhalation Hazard; indicated by temperature class.
• D. Toxic Inhalation Hazard; indicated in hazmat classes (e.g., Class 6 TIH).

Answer: (D)

TIH identifies materials that can cause harm if inhaled. In hazmat classification, TIH stands for Toxic Inhalation Hazard and is used to denote substances that pose a risk through inhalation. This designation is shown within the hazmat classification, most clearly as Class 6 Toxic Substances, and may be indicated on labeling, placards, and shipping papers as TIH or as Class 6 TIH. Recognizing this helps responders plan appropriate respiratory protection and incident-control measures, because inhalation exposure is the critical risk with these materials. The other options misstate what TIH stands for or how it is indicated (inhalation is the hazard, not ingestion or a non-class labeling, and TIH is tied to the hazmat class).