Which index is commonly used to monitor heat stress risk in workplace assessments?

• A. PMV
• B. WBGT
• C. RPE
• D. BMI

Answer: (B)

Monitoring heat stress risk in workplace assessments relies on an environmental index that captures how hot it truly feels when factors like humidity, radiant heat, and air movement come into play. The Wet-Bulb Globe Temperature combines measurements of humidity (wet-bulb), air temperature (dry-bulb), and radiant heat (globe) to reflect the body's heat load in typical work settings, indoors and outdoors. Because it integrates these key drivers of thermal strain, WBGT directly informs safety decisions such as work-rest schedules, hydration needs, and protective clothing choices. Other indices have different aims—for example, some assess thermal comfort in controlled environments, some rely on subjective effort, and one is a general health measure—none are as well-suited for quantifying acute heat stress risk in occupational settings as WBGT.