A crew can complete heat-stress training in the morning and still face a very different risk by mid-afternoon. The temperature climbs. Humidity changes. A worker takes on a heavier task. PPE traps more heat. A new employee is still acclimatizing. Another worker slept poorly after a night shift. The job that felt manageable at 9 a.m. becomes materially harder at 2 p.m.

That is the challenge with heat, physical strain, and fatigue: they are dynamic hazards. Awareness training matters because workers and supervisors need to recognize symptoms, understand controls, and know when to stop and escalate. But […]