Above which level of heat stress index it is not possible to work comfoably –
Correct Answer: 40 - 60
Description: 0 No thermal stress 10-30 Moderate to mild heat strain 40-60 severe heat strain 70-90 very severe heat strain 100 upper limit of heat tolerance Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 807
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Social & Preventive Medicine
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