Wet-bulb globe temperature

[1] It is used by industrial hygienists, athletes, sporting events and the military to determine appropriate exposure levels to high temperatures.

The American Conference of Governmental Industrial Hygienists publishes threshold limit values (TLVs) that have been adopted by many governments for use in the workplace.

[3] In hot areas, some[4] US military installations display a flag to indicate the heat category based on the WBGT.

The military publishes guidelines for water intake and physical activity level for acclimated and unacclimated individuals in different uniforms based on the heat category.

The NWS office in Tulsa, Oklahoma, in conjunction with Oral Roberts University's mathematics department, published an approximation formula to the WBGT that takes into account cloud cover and wind speed; in limited experimentation (four samples), the office claimed the estimate was regularly accurate to within 0.5 °F (0.28 °C), even with a simplification that reduces the equation from a four-degree polynomial to a linear relationship (the authors noted that the linear approximation was not tested for air temperatures under 68 °F (20 °C) since the WBGT is designed to measure heat stress, which seldom occurs below that threshold).