Table 2.

Correction factors (3rd column) for calculation of physical work capacity in outdoor working conditions with exposure to SOLAR at 800 W.m⁻²

Heat metric (°C)	Original PWC equation (Foster et al. 2021)	Correction factor at 800 W.m−2 radiation influx	Heat metric range (°C)
Low clothing coverage (0.26 Clo)
WBGT	$\mathit{PWC}=\frac{100}{1+{\left[\frac{33.51}{\mathit{WBGT}}\right]}^{-6.76}}$	Not required	12–36
UTCI	$\mathit{PWC}=\frac{100}{1+{\left[\frac{45.08}{\mathit{UTCI}}\right]}^{-4.78}}$	Not required	15–50
Twb	$\mathit{PWC}=\frac{100}{1+{\left[\frac{30.87}{T_{\mathit{wb}}}\right]}^{-6.24}}\text{--}{\mathit{PWC}}_{\mathit{corr}}$	$\mathit{PW}{\mathit{C}}_{\mathbf{corr}}=21.04\times e^{\left[-,0.5,{\left(\frac{T_{\mathit{wb}}-30.51}{8.505}\right)}^2\right]}$	10–33
Humidex	$\mathit{PWC}=\frac{100}{1+{\left[\frac{54.59}{\mathit{Humidex}}\right]}^{-4.55}}\text{--}{\mathit{PWC}}_{\mathit{corr}}$	$\mathit{PW}{\mathit{C}}_{\mathbf{corr}}=21.02\times e^{\left[-,0.5,{\left(\frac{Humidex-50.65}{10.54}\right)}^2\right]}$	13–55
Heat Index	$\mathit{PWC}=\frac{100}{1+{\left[\frac{54.28}{\mathit{Heat}\mathit{Index}}\right]}^{-4.37}}-{\mathit{PWC}}_{\mathit{corr}}$	$\mathit{PW}{\mathit{C}}_{\mathbf{corr}}=21.10\times e^{\left[-,0.5,{\left(\frac{HeatIndex-49.35}{13.02}\right)}^2\right]}$	14–55
High clothing coverage (0.86 Clo)
WBGT	$\mathit{PWC}=\frac{100}{1+{\left(\frac{33.76}{\mathit{WBGT}}\right)}^{-5.87}}$	Not required	12–36
UTCI	$\mathit{PWC}=\frac{100}{1+{\left(\frac{45.59}{\mathit{UTCI}}\right)}^{-3.98}}$	Not required	15–50
Twb	$\mathit{PWC}=\frac{100}{1+{\left[\frac{31.10}{T_{\mathit{wb}}}\right]}^{-5.54}}\text{--}{\mathit{PWC}}_{\mathit{corr}}$	$\mathit{PW}{\mathit{C}}_{\mathbf{corr}}=11.18\times e^{\left[-,0.5,{\left(\frac{T_{\mathit{wb}}-21.67}{9.234}\right)}^2\right]}$	10–33
Humidex	$\mathit{PWC}=\frac{100}{1+{\left[\frac{54.71}{\mathit{Humidex}}\right]}^{-3.81}}-{\mathit{PWC}}_{\mathit{corr}}$	$\mathit{PW}{\mathit{C}}_{\mathbf{corr}}=10.73\times e^{\left[-,0.5,{\left(\frac{Humidex-43.95}{15.99}\right)}^2\right]}$	13–55
Heat Index	$\mathit{PWC}=\frac{100}{1+{\left[\frac{55.79}{\mathit{Heat}\mathit{Index}}\right]}^{-2.68}}-{\mathit{PWC}}_{\mathit{corr}}$	$\mathit{PW}{\mathit{C}}_{\mathbf{corr}}=11.34\times e^{\left[-,0.5,{\left(\frac{HeatIndex-44.02}{18.05}\right)}^2\right]}$	14–55

The values need to be subtracted from the shaded values in our companion paper (2nd column; Foster et al., 2021b). For calculations of lower radiation levels, see Eq. (10) in the current paper for full model template and Eq. (17) for an example calculation