What first-aid measure is crucial for treating victims of mustard gas exposure?

The immediate removal of contaminated clothing is a critical first-aid measure for treating victims of mustard gas exposure. Mustard gas is a chemical warfare agent that can cause severe skin burns, respiratory complications, and damage to the eyes. The compound can adhere to clothing, and by removing contaminated garments, the risk of further skin exposure and absorption is minimized. This action also reduces the risk of the agent spreading to other areas of the body or affecting rescuers and bystanders.

Other first-aid measures, while important, do not address the immediate need to eliminate the source of contamination. Administering oxygen therapy can be necessary for respiratory distress caused by exposure, but it does not address the skin or eye exposure risks. Rinsing the eyes with saline is essential if they have been affected, yet it comes after ensuring that clothing has been removed to prevent further irritation. Application of cold compresses might provide some relief for skin burns but does not effectively mitigate the chemical's harmful effects and could unintentionally cool the body too much if applied excessively. Thus, removing contaminated clothing is a fundamental step in managing mustard gas exposure effectively.