Heat Illness

Any individual, regardless of age, sex or health status can develop heat stress if they are engaged in intense physical activity and/or exposed to environmental heat (and humidity). If heat exposure exceeds the physiologic capacity of the body to cool itself, and core body temperature rises, then a range of heat-related symptoms and conditions can develop – from relatively minor treatable heat cramps to severe life threatening heat stroke, which is always an extreme medical emergency. Even when acclimatized, adequate hydration is critical to avoid of development of heat-related illness. 

In order to prevent heat illness in employees, supervisors must monitor weather conditions, including projected temperatures and humidity.

Possible Indicators of Heat Illness

  • Thirst
  • Confusion
  • Slurred speech
  • Seizures
  • Fainting
  • Heavy sweating or hot, dry skin

Heat Illness Standards

California employers must take steps to protect workers from heat illness in both outdoor and indoor workplaces.

All employees and supervisors must be trained about heat illness.

Outdoor Heat Illness Standard
Title 8 California Code of Regulations
Section 3395
Indoor Heat Illness Standard
Title 8 California Code of Regulations
Section 3396
Temperature or heat index equals or exceeds
80°F Outdoors
High Heat:
Temperature or heat index equals or exceeds
95°F Outdoors
Temperature or heat index equals or exceeds
82°F Indoors
Radiant Heat:
Temperature or heat index equals or exceeds
87°F Indoors
Water and shade must be provided Water and cool-down areas must be provided

Please contact EH&S at 831-459-2553 or ehs@ucsc.edu with questions or for assistance.

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