How should responders treat an unknown liquid that may be TIH?

• A. Approach without PPE and call HazMat.
• B. Treat as TIH until proven safe; use Level A or Level B PPE and maintain distance; call HazMat.
• C. Use only splash protection.
• D. Immediately discharge neutralizing agents.

Answer: (B)

Unknown liquids that may be TIH are dangerous because inhalation or skin contact can cause rapid, severe harm. The safest approach is to assume it is TIH until proven otherwise, and to protect yourself accordingly. Establish a safe perimeter and wear the highest level of protective gear appropriate for potential TIH—Level A or Level B PPE—with SCBA or a supplied-air respirator to prevent inhalation, along with protective clothing to block dermal exposure. Maintaining distance reduces the chance of exposure while responders assess the situation. At the same time, call HazMat so professionals can identify the substance, determine the proper containment and decontamination steps, and guide the incident response.

Approaching without PPE would expose you immediately to unknown vapors and contact hazards. Relying on only splash protection is insufficient because TIH risks often include inhalation and dermal absorption beyond mere splash exposure. Trying to neutralize the liquid on the spot without knowing its identity can trigger dangerous reactions or spread contamination. Acting with caution and seeking expert guidance keeps responders safer and ensures the incident is handled correctly.