Sper Scientific 800037 WBGT Heat Stress SD Card Logger - Manual (Page 29)

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APPENDICES
Recommended heat exposure levels for
working and physical activity (permissible
heat exposure threshold):
Source: AAGIH 1992 (The American
Conference of Governmental Industrial
Hygienists)
Wet Bulb Globe Temperature Formula
Indoor/outdoor with no sun:
WBGT = (0.7 x WB) + (0.3 x TG)
Outdoor with full sun:
WBGT = (0.7 x WB) + (0.2 x TG) + (0.1 x
TA)
Work/rest
regimen Light Moderate Heavy
Continuous
work 30°C
(86°F) 26.7°C
(80°F) 25°C
(77°F)
75% work,
25% rest 30.6°C
(87°F) 28°C (82°F) 25.9°C
(78°F)
50% work,
50% rest 31.4°C
(89°F) 29.4°C
(85°F) 27.9°C
(82°F)
25% work,
75% rest 32.2°C
(90°F) 31.1°C
(88°F) 30°C
(86°F)