What is conducted on spaces that are under heat stress conditions?

• A. Heat stress survey
• B. Air quality test
• C. Ventilation check
• D. Thermal imaging

Answer: (A)

When spaces are experiencing heat exposure, the assessment that directly characterizes how that heat affects people is a heat stress survey. This approach collects environmental data such as temperature, humidity, air velocity, and radiant heat, and combines it with factors like workload and clothing to estimate heat stress risk for occupants. It often leads to calculating a heat stress index (like WBGT) and guides practical controls—cooling, ventilation, work-rest schedules, and appropriate PPE—to reduce risk.

Air quality tests focus on contaminants rather than heat exposure. Ventilation checks look at air exchange and flow but don’t quantify how dangerous the heat itself is for people. Thermal imaging shows surface temperatures and hotspots, which can help identify where heat is concentrated, but it doesn’t assess the overall human heat exposure and risk.