Ergonomics of the thermal environment - Assessment of heat stress using the WBGT (wet bulb globe temperature) index (ISO 7243:2017)

This document establishes a standardized methodology for assessing heat stress in environments using the Wet Bulb Globe Temperature (WBGT) index. It outlines the procedures required to measure key environmental variables, including air temperature, radiant heat, humidity, and air velocity, to calculate the WBGT value accurately. The content specifies the characteristics of appropriate measurement instruments, detailing their calibration requirements and placement protocols to ensure data reliability. It further provides guidance on how to interpret the calculated index values in relation to human physiological responses and work capacity limits. The text includes definitions for various operational scenarios and exposure durations, allowing for consistent evaluation of thermal stress across different industrial and occupational settings. By adhering to these technical specifications, organizations can implement uniform practices for identifying potential heat-related risks and determining necessary control measures to protect worker health and safety.