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NEW DELHI – A new study from Tulane University has revealed a dramatic link between extreme heat and high humidity, finding that the combination can spike the risk of a heart-related emergency by up to six times. The findings, published in the journal Science of The Total Environment, underscore a significant public health threat, especially in tropical regions and a warming world.
Researchers analyzed over 340,000 emergency room visits for heart issues in Dhaka, Bangladesh, a city known for its intense heat and humidity, between 2014 and 2019. The study found that while extreme heat alone increased the risk of a cardiac emergency by 4.4% on low-humidity days, the risk surged to an alarming 26.7% on the most humid days, where relative humidity topped 82%.
“We know extreme heat can have a negative health impact, but I never expected such a dramatic increase in risk when high humidity is also factored in,” said Mostafijur Rahman, the study’s first author and an assistant professor of environmental health sciences at Tulane University.
The human body cools itself by sweating, but high humidity prevents sweat from evaporating, trapping heat and forcing the heart to pump harder to maintain a stable body temperature. This added strain can be particularly dangerous for individuals with pre-existing heart conditions.
With climate change expected to increase the frequency and intensity of hot and humid days, the study’s authors hope these findings will prompt governments to develop early warning systems and encourage public education on staying safe. For individuals, this includes staying hydrated, limiting outdoor activity during peak heat, and seeking out air-conditioned public spaces like libraries or malls.
Disclaimer: This news article is for informational purposes only and does not constitute medical advice. Consult with a healthcare professional for personalized guidance regarding your health and any specific medical conditions.
Reference: Rahman, M. M., et al. (2025). “Compounding effects of heat and high humidity on cardiovascular morbidity in Dhaka, Bangladesh: An implication of climate crisis.” Science of The Total Environment.
