Extreme heat in India can cause approximately 3,400 excess deaths in a single day [1].
These findings highlight the lethal impact of prolonged heatwaves on public health and the urgent need for mitigation strategies in vulnerable regions. The scale of mortality suggests that current infrastructure may be insufficient to protect populations during peak temperature events.
Researchers from the Indian Institute of Tropical Meteorology (IITM) and their collaborators conducted the study [1]. The data focused on a period in late May 2024 when maximum temperatures rose above 45 °C [1].
According to the study, the number of excess deaths can climb to nearly 30,000 over a five-day heatwave [1]. This spike in mortality is particularly evident in the states of Madhya Pradesh, Rajasthan, Uttar Pradesh, and Haryana [1], [2].
The researchers said that temperatures exceeding 45 °C significantly increase heat-related mortality [1]. This risk is most acute among vulnerable populations who lack access to cooling or work in outdoor environments, factors that exacerbate the physiological stress of extreme heat.
The study emphasizes that the cumulative effect of multiple days of extreme heat creates a compounding crisis. While a single day of heat is dangerous, the sustained nature of a heatwave prevents the body and the environment from recovering, leading to the higher death tolls observed in the northern and central states [1].
“Extreme heat in India can cause approximately 3,400 excess deaths in a single day.”
The study underscores a critical intersection between climate volatility and public health in South Asia. By quantifying the 'excess' deaths—mortality above the expected baseline—the research provides a clearer picture of how extreme temperature spikes act as a direct catalyst for mass casualty events. This data suggests that heatwaves in India are no longer just weather anomalies but are systemic health threats requiring state-level intervention in urban planning and emergency response.
