The Boiling Point of Humanity: When Does Heat Kill?
Core Body Temperature: The human body functions best at around 98.6°F (37°C). When core temperature exceeds 104°F (40°C), heatstroke—a life-threatening condition—can occur.
Wet-Bulb Temperature Limit: A wet-bulb temperature of 95°F (35°C) is considered the upper limit for human survivability.
Heatstroke Danger: Heatstroke happens when the body can't regulate its temperature. Symptoms include confusion, seizures, and unconsciousness.
Humidity Makes It Worse: High humidity reduces the body’s ability to sweat, trapping heat and increasing the risk of overheating.
Dehydration Risk: Prolonged heat leads to fluid loss. Severe dehydration reduces blood volume, strains the heart, and can cause shock.
At-Risk Groups: The elderly, infants, outdoor workers, and people with medical conditions are more vulnerable to heat-related illnesses.
Nighttime Heat: When temperatures don’t drop at night, the body doesn’t get a chance to cool down, raising health risks.
Urban Heat Islands: Cities trap more heat due to concrete and limited greenery, making urban populations more vulnerable.