Table 4.

| List of abbreviations used for the computation of the 187 meteo-based thermal stress indicators.

ID	Variable	Abbreviation	Formula / Value	Assumption/s
1	Air Temperature (undefined unit)	Ta	Input value
2	Relative Humidity (%)	RH	Input Value
3	Air Velocity (undefined unit)	WS	Input Value
4	Solar Radiation (undefined unit)	SR	Input Value
5	Wet Bulb Globe Temperature (undefined unit) [30]	WBGT	TSI # 171
6	Vapor Pressure (undefined unit) [168]	VP	= 6.11 * (10 ^ ((7.5 * Td[°C]) / (237.3 + Td[°C]))) ⇒ Td = TSI # 52
7	Barometric Pressure (hPa)	P	= 1016
8	Mean Radiant Temperature (undefined unit)	Tmrt	TSI # 97
9	Absolute Humidity (g/kg) [169], [170]	h	= (6.112 * Exp((17.56 * Ta[°C]) / (Ta[°C] + 243.5)) * RH * 2.1674) / ((273.15 + Ta[°C]) * 1.204 * 10 ^ 3) * 1000
10	Wet Bulb Temperature [97] (undefined unit)	Tw	TSI # 172
11	Radiant heat exchange coefficient (w/m2)	Hr	= 4 * ε * σ * Ar/ADu * ((273.2 + ((Tsk[°C] + Tmrt[°C]) / 2)) ^ 3)
12	Mean Skin Temperature [112]	Tsk	TSI # 98
13	Friction coefficient (unitless)	α	= 0.20
14	Emissivity of skin (unitless)	ε	= 0.97
15	Universal radiation constant (w/m2·K4) [171]	σ	= (5.67 * (10 ^ -8))
16	Fraction of the body affected by radiation	Ar	= 0.77
17	Globe Temperature (undefined unit) [97]	Tg	TSI # 78
18	Latent heat released by water vaporization (cal/g) [172]	r	= 585
19	Real mixture ratio (g/kg) [172]	w	= RH * ((6.112 * 10 ^ (7.5 * Ta[°C] / (237.7 + Ta[°C]))) / P) / 100
20	Specific heat of air at constant pressure (cal/°C/g) [172]	Cp	= 0.24
21	Specific heat of water (cal/°C/g) [172]	Cw	= 1
22	Body tissue thermal resistance (kcal/h/°C/m2)	Rb	= 0.08
23	Convection heat transfer coefficient (w/m2)	Hc	⇒ if WS < 1 Then = 8.7 * WS[m/s] ^ 0.6 ⇒ if WS >= 1 Then = 3.5 + 5.2 * WS[m/s]
24	Psychrometric wet bulb (undefined unit)	Tpw	TSI # 118
25	Metabolic rate (w/m2)	Met	low intensity = 100; moderate intensity = 165; and high intensity = 230
26	Body surface area (m2) [173]	ADu	= 0.202 * height[m] ^ 0.725 * weight[kg] ^ 0.425
27	Clothing insulation (clo)	Icl	Icl = 1.691 - 0.0436 * Ta[°C] ⇒ if Ta[°C] < -30 Then = 3 ⇒ if Ta[°C] > 25 Then = 0.6
28	Saturated vapor pressure (undefined unit)	SVP	= (2.7150305 * Log(Ta[k]) - 2836.5744 * Ta[k] ^ (-2) - 6028.076559 / Ta[k] + 19.54263612 - 0.02737830188 * Ta[k] + 0.000016261698 * Ta[k] ^ 2 + 7.0229056E-10 * Ta[k] ^ 3 - 1.8680009E-13 * Ta[k] ^ 4) * 0.01
29	Core temperature (°C)	Tcr	= 37.3
	Notes: “undefined unit” indicates that the variable is not characterized by the same unit for all TSIs. [subscript] condition which characterizes the variable (e.g., V10m = air velocity at a height of 10 m). [superscript] unit of the variable:
	[°C]	degrees Celsius
	[°F]	degrees Fahrenheit
	[hPa]	hectopascal
	[kPa]	kilopascal
	[mmHg]	millimeter of mercury
	[ft/min]	feet per minute
	[m/s]	meters per second
	[cm/s]	Centimeters per second
	[Btu/hr]	British thermal units per hour
	[mb]	millibar
	[mph]	miles per hour
	[cal/cm2/min]	calories per square centimeter per minute
	[Torr]	unit of pressure, Torr
	[kw/m2]	kilowatts per square meter
	[w/m2]	watts per square meter
	[K]	Kelvin
	[km/h]	kilometers per hour