Which is a form of active cooling?

• A. Rest in a shady area
• B. Removal of PPE
• C. Application of wet, cool towels
• D. Rest in an air-conditioned environment

Answer: (C)

Active cooling refers to methods that actively remove heat from the body using external means, rather than waiting for the body to shed heat passively. In firefighter rehab, these techniques lower body temperature quickly when someone is overheated. Applying wet, cool towels provides evaporative and conductive cooling: the water on the skin absorbs heat as it warms, and as it evaporates it carries away heat from the body, lowering skin temperature and helping reduce overall heat strain. This makes it more effective at reducing core temperature than simply relying on the environment or passive options.

Resting in a shady area or resting in an air-conditioned environment are passive cooling approaches—they rely on the surroundings to reduce heat but don’t actively remove heat from the body. Removing PPE can help lessen heat load, but by itself it isn’t a cooling method—it reduces insulation rather than actively cooling through a heat-transfer process.