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. 2019 Feb 17;97(4):1456–1467. doi: 10.1093/jas/skz024

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Figure 2. — Environmental temperature humidity index (THI) retrieved daily at noon from late May to late August 2015. THI = T_db – [0.55 – (0.55 × RH/100) × (T_db – 58)]; T_db = dry bulb temperature (°F), and RH = relative humidity. Recovery (non-life threatening, 75) and emergency (high-risk, 85) thresholds as described by Hahn (1999). Average represents the overall average THI (88) throughout the duration of the trial.