Employers should have a robust heat stress prevention program that ensures workers are protected. Use of the HI or WBGT is important, but other factors such as strenuous physical activity also cause heat stress among workers.However, if you have the ability, NIOSH recommends using wet bulb globe temperature (WBGT)-based Recommended Exposure Limits (RELs) and Recommended Alert Limits (RALs) in hot environments. The simplicity of the HI makes it a good option for many outdoor work environments (as long as there are no additional radiant heat sources, such as, fires or hot machinery). ![]()
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