Heat Safety
Outdoor Worker Heat Safety: Humidity, Shade, Water, Breaks, and Warning Signs
Heat safety guidance for outdoor workers, including humidity, heat index, breaks, hydration, shade, acclimatization, and warning symptoms.
Quick answer: Outdoor heat risk rises when the body cannot cool efficiently, especially during high humidity, direct sun, heavy work, and poor acclimatization.
Heat index context
Humidity makes sweat evaporate more slowly, which makes the same air temperature feel more stressful.
Direct sun, heavy clothing, and hot surfaces can raise the real-world burden.
Work planning
Schedule heavy work for cooler hours, rotate tasks, use shade, and build breaks into the plan.
New or returning workers often need time to acclimate.
Warning signs
Dizziness, confusion, fainting, heavy sweating that stops, and hot dry skin can signal serious heat illness.
When symptoms escalate, treat it as urgent.