Working in Cold Environments
Anyone who works in a cold environment may be at risk of cold stress. Many occupations—such as snow removal crews, sanitation workers, police officers, firefighters, and emergency medical technicians (EMTs)—require employees to spend long hours outdoors in freezing or wet conditions. Without proper precautions, prolonged exposure to cold temperatures can cause serious health problems and even be life-threatening.
Cold stress occurs when the body is unable to maintain its normal internal (core) temperature. Prolonged exposure to cold air, water, or wind can lower skin temperature, and eventually, the core temperature, leading to dangerous conditions such as frostbite, hypothermia, and trench foot.
When the body begins to cool, it responds by redirecting blood flow away from the extremities—such as the hands, feet, arms, and legs—toward the vital organs in the chest and abdomen. This process helps protect the core temperature but causes the outer areas of the body to cool rapidly, significantly increasing the risk of tissue damage.
If these conditions persist, cold stress can progress to severe injury or death.
Common Health Risks
- Frostbite: Freezing of skin and underlying tissues, often affecting fingers, toes, ears, and nose.
- Hypothermia: A dangerous drop in body temperature below 95°F, affecting the brain and body function.
- Trench Foot: Caused by prolonged exposure to wet and cold conditions, even above freezing temperatures.
Risk Factors for Cold Stress
Several environmental and personal factors can increase susceptibility to cold stress:
- Low air temperatures
- High wind speeds (wind chill effect)
- Wet or damp air and inadequate waterproof protection
- Improper clothing or layering for cold weather
- Fatigue or physical exhaustion
- Health conditions such as hypertension, hypothyroidism, or diabetes