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Hot Weather Work and Proper Hydration
One of the most important things to safely work in the heat and prevent heat illness is drinking enough fluids.
Resources:
https://www.cdc.gov/niosh/mining/UserFiles/works/pdfs/2017-126.pdf
https://www.cdc.gov/niosh/topics/heatstress/recommendations.html
https://www.osha.gov/heat-exposure/water-rest-shade