Study Reveals Alarming Indoor Heat Exposure in Low-Income Households in Chennai
Most households can record up to 7 mnths of heat exposure: Study
Hindustan Times
Image: Hindustan Times
A recent study by Climate Trends highlights that low- and middle-income households in Chennai, India, experience severe night-time thermal heat stress, with indoor temperatures often exceeding 32°C for up to 7 months. The findings call for urgent policy changes to include indoor heat monitoring in urban Heat Action Plans.
- 01Low- and middle-income households in Chennai face indoor temperatures exceeding 32°C for significant portions of the year.
- 02The study recorded indoor heat exposure of 3,000 to 5,000 hours, translating to 4 to 7 months of persistent heat.
- 03Night-time temperatures rarely drop below 31°C, impacting residents' sleep and recovery.
- 04Current Heat Action Plans do not mandate indoor temperature monitoring, focusing instead on outdoor conditions.
- 05Policy recommendations include revising building codes and enhancing communication strategies for vulnerable populations.
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A study conducted by Climate Trends, presented at the India Heat Summit 2026 in New Delhi, reveals alarming levels of indoor heat exposure in low- and middle-income households in Chennai, India. The research, which utilized high-resolution sensor data across 50 households from October 2025 to April 2026, found that indoor temperatures frequently exceed 32°C, with some households experiencing up to 5,800 hours of heat exposure, equivalent to 8 months. Notably, temperatures peak between 8 PM and 9 PM, as concrete structures release stored heat, causing indoor temperatures to remain above 34°C well into the night.
The study emphasizes the need for integrating indoor heat monitoring into urban Heat Action Plans, as current frameworks primarily focus on outdoor temperatures. Aarti Khosla, founder of Climate Trends, highlighted the urgent need for interventions, noting that even during cooler months, indoor temperatures rarely fell below 31°C. The disparity in cooling solutions is stark; while high-income households often have air conditioning, low-income households rely solely on ceiling fans, exacerbating heat exposure.
The summit featured discussions on the necessity of revising building codes to ensure thermal comfort for all, particularly those in informal housing structures. Experts stressed the importance of inclusive communication strategies to reach vulnerable populations, ensuring they receive timely weather forecasts and warnings. The findings underscore the pressing need for comprehensive policy changes to address the growing challenge of heat stress in urban India.
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The findings highlight the urgent need for policy changes to improve living conditions for low-income households in Chennai, as chronic heat exposure can adversely affect health and well-being.
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