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Heat stress indices (HIS) combine the effects of both temperature and relative humidity, and are classified into alert, danger, and emergency zones. Because different animal species and humans have different sensitivities to temperature and relative humidity, the heat stress charts are thus unique of that particular species.
Livestock Industry Facilities and Environment
Iowa State University Extension and Outreach
Agricultural and Biosystems Engineering
Agricultural Education | Bioresource and Agricultural Engineering
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Xin, Hongwei and Harmon, Jay D., "Livestock Industry Facilities and Environment: Heat Stress Indices for Livestock" (1998). Agriculture and Environment Extension Publications. 163.