Employee Safety In Extreme Heat

Employee Safety In Extreme Heat

June 29, 2021

There are a number of workplace exposures that can result in fatalities. The two most common and most talked about are falls and motor vehicle accidents.  But, there is another exposure that millions of workers face that is not talked about as much, Heat Stress. 


  • The Bureau of Labor Statistics data shows that between 1992 and 2016, 783 workers in the US died and more than 69,000 workers suffered serious injuries due to heat exposure at work. Not surprisingly, 90% of these serious incidents occur between June and September. 
  • OSHA does not have a specific standard that covers working in a hot environment, but under the General Duty Clause there is a responsibility to keep your employees safe. 
  • OSHA has a table of heat indices and they advise that a heat index of less than 91 degrees is low risk, 91 to 103 degrees is moderate risk, 103-115 is high risk and over 115 is extreme.   
    • Fortunately, to make implementing controls a bit easier, OSHA and NIOSH have produced an app named the OSHA-NIOSH Heat SafetyTool. The app provides real-time weather data including, heat index, precautions that should be taken, a symptom checker and first aid information for workers suffering heat strain. It is available at Apple Store & Google Play. 


There are a few basic things employers can do to help prevent serious heat related illnesses. Share these tips to help keep your employees and co-workers safe! 

  • Train workers about the conditions that lead to heat stress and how to protect themselves. All workers should know what to do if a coworker becomes ill from the heat, including when it would be appropriate to call a supervisor for help versus calling 911. 
  • Educate all employees to show up for work fully hydrated, to limit alcohol and caffeine consumption in hot weather, and to stay hydrated throughout the workday by drinking plenty of fluids.
  • OSHA recommends employers provide at least one pint of water per hour for every worker. 
    • Water should be in a marked and closed container (e.g., “Drinking Water”) 
    • There should be no sharing of water between employees 
  • Encourage workers to wear breathable cotton clothing and if working outdoors, employees should wear protection like sunglasses, hats, and sunscreen. 
  • Employers should offer regular breaks in a shaded or well-ventilated area.  
  • Whenever possible, set up shades or screens to keep workers out of direct sunlight. Providing fans and evaporative coolers is also something that can help prevent workers from becoming ill due to heat exposure.  
  • According to OSHA 50-70% of fatalities occur in the first few days of working outside during high heat. Because workers acclimate to heat over time, workloads should be gradually increased as workers acclimate or as new workers come to the job. 

Printable Heat Prevention Handout for Employees


Heat stress, from exertion or hot environments, places workers at risk for illnesses such as heat stroke, heat exhaustion, or heat cramps. Share the tips below with your employees to help them avoid heat illnesses! Printable Handout Here!

Heat Cramps:

  • Occur when the body's levels of salt and moisture are depleted, aka excessive sweating.
  • Symptoms: Muscle Cramps, Pain, or Spasms in the abdomen, arms or legs.
  • First Aid:
    1. Stop All Activity.
    2. Sit in a cool area. If there is no indoor access, go under shade.
    3. Drink clear juice, a sports beverage, or water with food.
    4. Avoid salt tablets.
    5. Do not return to work for a few hours after cramping subsides.
    6. If cramping does not subside within 1 hour seek medical attention.

Heat Exhaustion:

  • The body's response to an excessive loss of water and salt, usually through sweating.
  • Symptoms: Heat Cramps, Rapid Heartbeat, Heavy Sweating, Extreme Weakness, Dizziness, Nausea, Vomiting, Irritability, Fast Shallow Breathing, Slightly elevated body temperature
  • First Aid:
    1. Stop all activity.
    2. Rest in a cool area.
    3. Drink plenty of cool beverages.
    4. Take a cool shower, bath or sponge bath.
    5. Do not return to work for the day.
    6. If symptoms worsen or do not improve within 1 hour seek medical attention.

Heat Stroke:

  • When the body loses control of regulating its temperature. This is the most serious heat-related illness and can lead to permanent damage or death.
  • Symptoms: High Body Temperature, Confusion, Lack of Coordination, Hot and Dry Skin, Profuse Sweating, Rapid Heartbeat and Breathing, Throbbing Headache, Fainting, Seizures, Coma.
  • First Aid
    1. Call 911 and/or seek medical assistance.
    2. Move worker into a cool, shaded area.
    3. Remove any excessive clothing.
    4. Try to cool their body down by applying cool water to their body, covering them with cool wet towels, applying ice to their armpits, neck, and wrists.
    5. Stay with the workers until help arrives.
    6. Do not force the victim to drink liquids or allow them to take pain killers or salt tablets.

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