Wet Bulb Heat: India's Silent Heatwave Killer When Humidity Traps Body's Cooling

Wet bulb heat conditions pose life-threatening risks to children, elderly people, outdoor workers, pregnant women, and those with pre-existing health conditions, with potential for rapid heatstroke and death.

Across northern India, a heatwave has crossed into territory where thermometers alone can no longer tell the full story. When heat and humidity converge beyond a critical threshold, the human body loses its oldest defense — the ability to cool itself through sweat — and survival narrows to a matter of hours. Scientists call this wet bulb heat, and what is unfolding now in Delhi, Rajasthan, Uttar Pradesh, and Vidarbha is not merely a seasonal extreme but a glimpse of a more dangerous climate future arriving ahead of schedule.

Wet Bulb Heat: India's Silent Heatwave Killer When Humidity Traps Body's Cooling

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