India heatwave health concerns escalated in 2024 as individuals faced nearly 20 heatwave days on average. Around six-and-a-half of these days would not have happened without climate change, a new Lancet report indicates. This global study underlines the serious health crisis tied to our changing environment. The ninth edition of The Lancet Countdown on Health and Climate Change delivers a comprehensive assessment of these connections.
Heat exposure in 2024 led to a substantial loss of 247 billion potential labor hours annually. This marks a record high, averaging almost 420 hours per person. Consequently, this represents a 124 percent increase compared to the 1990-1999 period. A reduced capacity for labor due to extreme heat contributes to significant economic strain. Estimates suggest a potential income loss of USD 194 billion in 2024 because of these factors.
The agriculture sector bore the brunt of these losses in 2024, accounting for 66 percent. The construction sector also experienced 20 percent of the losses. An international team of 128 experts from 71 institutions collaborated on this report. They warn about dangers from continued fossil fuel reliance and adaptation failures. Such issues jeopardize lives, health, and livelihoods. Alarmingly, 12 of 20 health threat indicators have reached unprecedented global levels.
Understanding India Heatwave Health Impacts
Heat-related deaths have surged considerably, increasing by 23 percent since the 1990s. Annually, this now reaches 546,000 fatalities. Moreover, the average spread potential of dengue has risen by up to 49 percent globally since the 1950s. Focusing specifically on India, individuals faced an average of 19.8 heatwave days each in 2024. Notably, 6.6 days of this exposure would not have happened without climate change. This data comes from an accompanying country-related sheet.
Pollution’s Deadly Toll
Beyond heatwaves, air pollution also presents a grave health challenge. During 2020-2024, an average of 10,200 deaths per year in India resulted from PM2.5 pollution caused by forest fires. This marks a 28 percent increase from rates observed during 2003-2012. Human-caused PM2.5 pollution was responsible for over 17 lakh deaths in 2022. This figure represents a 38 percent rise since 2010. Furthermore, the use of fossil fuels like coal and liquid gas contributed to 44 percent of these deaths. Road transport using petrol also contributed to 2.69 lakh deaths.
Frequently Asked Questions
Q1: How many heatwave days did India experience in 2024, and how many were linked to climate change?
In 2024, people in India experienced nearly 20 heatwave days on average. Of these, approximately 6.6 days would not have occurred without climate change, according to The Lancet report.
Q2: What was the economic impact of heat exposure on labor in India during 2024?
Heat exposure in India during 2024 resulted in a loss of 247 billion potential labor hours. This led to an estimated income loss of USD 194 billion for the year.
Q3: What role did PM2.5 pollution play in health issues in India?
From 2020-2024, an average of 10,200 deaths per year in India were linked to PM2.5 pollution from forest fires. Human-caused PM2.5 pollution caused over 17 lakh deaths in 2022, with fossil fuel use contributing significantly to these fatalities.
References
- People in India each saw 20 heatwave days in 2024, 6.5 linked with climatechange: Lancet report – ETHealthworld
- The Lancet Countdown on Health and Climate Change. The 2025 Report of The Lancet Countdown on Health and Climate Change: Climate change action offers a lifeline. Available at: https://www.lancetcountdown.org/2025-report/ (Accessed October 30, 2025).
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