Heat Awareness for Workers

Working in hot conditions isn’t just difficult—it’s dangerous. Every year – dozens of workers die and thousands more become ill while working in extreme heat or humid conditions.

When the human body is unable to maintain a normal temperature, heat-related illnesses can occur and may result in death. Likewise, there are a range of heat illnesses and they can affect anyone, regardless of age, or physical condition.

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Heat Stress Awareness

Workers at risk of heat stress include outdoor workers and workers in hot environments such as firefighters, bakery workers, farmers, construction workers, miners, boiler room workers, factory workers, and others. Workers at greater risk of heat stress include those who are 65 years of age or older, are overweight, have heart disease or high blood pressure, or take medications that may be affected by extreme heat.

Heat is the number one cause of weather-related deaths in the U.S. (and many countries around the world). The last Friday in May is National Heat Awareness Day – an event established to encourage employers and workers to recognize the warning signs for heat illness and keep workers safe.

The National Weather Service (NWS) just released their Natural Hazard Statistics for 2018, and heat killed more people last year than lightning, tornadoes, hurricanes, cold, and winter weather combined.

Likewise, according to the U.S. Bureau of Labor Statistics (BLS), there were 815 heat-related worker deaths and 70,000 heat-related serious injuries between 1992 and 2017.

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Employer Responsibility to Protect Workers

Under OSHA law, employers are responsible for providing workplaces free of known safety hazards. This includes protecting workers from extreme heat. An employer with workers exposed to high temperatures should establish a complete heat illness prevention program.

  • Provide workers with water, rest and shade.
  • Allow new or returning workers to gradually increase workloads and take more frequent breaks as they acclimatize, or build a tolerance for working in the heat.
  • Plan for emergencies and train workers on prevention.
  • Monitor workers for signs of illness.
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Factors That Increase Heat Stress Risk to Workers

  • High temperature and humidity
  • Direct sun exposure (with no shade)
  • Indoor exposure to other sources of radiant heat (ovens, furnaces)
  • Limited air movement (no breeze)
  • Low fluid consumption
  • Physical exertion
  • Heavy personal protective clothing and equipment
  • Poor physical condition or health problems
  • Some medications, for example, different kinds of blood pressure pills or antihistamines
  • Pregnancy
  • Lack of recent exposure to hot working
  • Previous heat-related illness
  • Advanced age (65+)

Using the Heat Index: A Guide for Employers

Outdoor workers who are exposed to hot and humid conditions are at risk of heat-related illness. The risk of heat-related illness becomes greater as the weather gets hotter and more humid. This situation is particularly serious when hot weather arrives suddenly early in the season, before workers have had a chance to adapt to warm weather.

Outdoor workers include any workers who spend a substantial portion of the shift outdoors. Examples include construction workers, agricultural workers, baggage handlers, electrical power transmission and control workers, and landscaping and yard maintenance workers. These workers are at risk of heat-related illness when the heat index is high. Additional risk factors are listed below. These must be taken into consideration even when the heat index is lower.

  • Work in direct sunlight – adds up to 15 degrees to the heat index.
  • Perform prolonged or strenuous work
  • Wear heavy protective clothing or impermeable suits
Heat IndexRisk LevelProtective Measures
< 91°FLower (Caution)Basic heat safety and planning
91°F to 103°FModerateImplement precautions and heighten awareness
103°F to 115°FHighAdditional precautions to protect workers
> 115°FVery High to ExtremeTriggers even more aggressive protective measures

How can OSHA help? Workers have a right to a safe workplace. If you think your job is unsafe or have questions, visit OSHA’s Worker’s Page or call 1-800-321-6742 (OSHA). It’s confidential. For other valuable worker protection information, such as Workers’ Rights, Employer Responsibilities, and other services OSHA offers, visit OSHA’s Workers’ page.

OSHA also provides help to employers. OSHA’s On-site Consultation Program offers free and confidential advice to small and medium-sized businesses in all states across the country, with priority given to high-hazard worksites. For more information or for additional compliance assistance contact OSHA at 1-800-321-6742 (OSHA).

Additional Heat Illness Guidance/Resources