You are evaluating heat stress in workers digging a ditch by hand to lay sewage pipes. You obtain the following average values over a two hour period: Natural Wet Bulb (NWB) temperature = 27.0° C, Globe Temperature (GT) = 32.0° C, and Dry Bulb (DB) temperature = 30.0° C. Which WBGT index would you use to evaluate heat stress for this operation? Calculate a WBGT value for digging the trench. What control methods would you suggest to reduce the risk of heat illness in these workers?
Your essay should be at least 100 words in length apa format.