TABLE 2.

Formulae used to calculate environmental parameters.

No	Formula	References
1	THI = (1.8 × Tdb +32) − [(0.55–0.0055 × RH) × (1.8 × Tdb −26)]	Hammami et al. (2013)
2	Adjusted THI (THIadj) = [4.51 + THI − (1.992 × WS) + (0.0068 × RAD)] where THI = (0.8 × Tdb) + [RH × (Tdb −14.4)] + 46.4
3	Heat load index (HLI) = 8.62 + (0.38 × RH) + (1.55 × BG) − (0.5 × WS) + e (2.4−WS), when BG > 25, HLI = 10.66 + (0.28 × RH) + (1.3 × BG) − WS, when BG ≤ 25, where BG = (1.33 × Tdb) − (2.65 × Tdb 0.5) is the predicted globe temperature (°C)
4	TI4: Equivalent temperature index (ETI) = 27.88 − (0.45 × Tdb) + (0.010754 × Tdb 2) − (0.4905 × RH) + (0.00088 × RH2) + (1.1507 × WS) − (0.12644 × WS2) + [0.019876 × (Tdb × RH)]—[0.04631 × (Tdb × WS)]
5	TI5: Environmental stress index (ESI) = (0.63 × Tdb) − (0.03 × RH) + (0.02 × RAD) + [0.0045 × (Tdb × RH)] − [0.073 × (0.1 + RAD) −1]
6	TI6: comprehensive climate index (CCI) = RHadj + WSadj + RADadj, where RH e adj = × × db)

^a WS, wind speed; RAD = solar radiation.