What procedure is used to assess spaces under heat stress conditions?

• A. Heat stress survey
• B. Thermal imaging
• C. Ventilation test
• D. Temperature log

Answer: (A)

Assessing spaces under heat stress conditions requires a method that systematically evaluates all factors contributing to heat risk, including heat sources, environmental conditions, workload, and how long people are exposed. A heat stress survey is designed for this purpose. It involves a structured walk-through to identify hot work areas, collect environmental data (temperature, humidity, radiant heat, and air movement), consider the metabolic heat produced by tasks, and assess exposure duration, then use this information to gauge risk and determine appropriate controls such as cooling, shading, hydration, work/rest schedules, and PPE. This integrated approach is what makes it the best fit for assessing heat stress conditions across a space.

Thermal imaging can help spot hotspots, but it only shows surface temperatures and doesn’t capture the full exposure profile or workload factors. A ventilation test looks at air flow and exchange but doesn’t quantify overall heat load or exposure duration. A temperature log records temperatures over time but lacks information on humidity, radiant heat, air movement, and workload, all of which are essential to evaluating heat stress risk.