NEW DELHI — As heatwaves are increasingly categorized as formal disasters, a new initiative in India’s capital is utilizing personal testimonies from slum residents to develop protection strategies for those living in the city’s most densely populated districts. The project, which centers on “slum diaries,” seeks to document the survival mechanisms of the urban poor who face temperature spikes reaching as high as 54 degrees Celsius (129 degrees Fahrenheit), providing a granular look at how extreme heat intersects with poverty and inadequate housing.
The initiative focuses on bridging the gap between high-level meteorological data and the actual lived experiences of residents in informal settlements. By recording the daily struggles and improvised cooling methods of those in Delhi’s most vulnerable neighborhoods, the project aims to inform disaster management policies that have historically relied on city-wide averages rather than the hyper-local realities of slum environments.
The Reality of Extreme Thermal Stress
For residents of Delhi’s informal settlements, the summer months are not merely uncomfortable but are a struggle for basic survival. The project’s documentation reveals a pattern of rudimentary, labor-intensive cooling methods used to combat oppressive heat in cramped, poorly ventilated spaces.
One resident, Gulshan, describes a nightly routine of washing the floors of her single-room home multiple times every evening. This practice is a desperate attempt to lower the ambient temperature of the room to a level where she and her four children can sleep. Such methods are common in areas where the structural materials of the housing—often corrugated metal sheets or thin concrete—absorb and radiate heat long after the sun has set.
These diaries highlight a critical disconnect: while a city-wide temperature reading may indicate a severe heatwave, the “indoor” temperature within a slum dwelling is often significantly higher due to the lack of insulation, overcrowding, and the “urban heat island” effect, where dense building materials and a lack of green space trap heat.
Why It Matters: The Inequality of Cooling
The significance of this project lies in its recognition that heat is not a democratic disaster. While wealthier residents of Delhi can retreat into air-conditioned environments, the urban poor are exposed to the elements in a way that directly impacts their health, productivity, and survival.
The disproportionate impact of heat on informal settlements is a result of systemic vulnerabilities. In these districts, the lack of formal planning means houses are built close together, blocking airflow. The materials used for roofing and walls often exacerbate thermal stress, turning small living quarters into ovens during peak daylight hours.
By treating heatwaves as formal disasters, the project advocates for a shift in how the state allocates resources. If heat is viewed through the lens of disaster management, it opens the door for emergency interventions, such as the creation of cooling centers, the distribution of heat-reflective paints for roofs, and the implementation of targeted health alerts for those without access to mechanical cooling.
Analysis:
The shift toward recognizing heatwaves as disasters indicates a transition in how urban governance addresses climate change. By integrating “slum diaries” and personal narratives into disaster planning, the project acknowledges that standard cooling infrastructure—such as air conditioning or high-quality insulation—is inaccessible to a significant portion of Delhi’s population.
This approach suggests that effective climate adaptation in South Asian megacities requires hyper-local data and a focus on the specific vulnerabilities of informal housing rather than city-wide generalities. It moves the conversation from “weather events” to “institutional failures,” highlighting how the lack of secure housing and urban planning transforms a natural phenomenon into a humanitarian crisis.
Background and Context: The Escalating Heat Crisis
Delhi has long been prone to severe summers, but the frequency and intensity of heatwaves have surged in recent years. The city’s rapid expansion has led to a massive increase in concrete surfaces and a corresponding decrease in tree cover, intensifying the heat island effect.
In India, the classification of heatwaves as disasters is a relatively recent evolution in policy. Historically, disaster management focused on sudden-onset events like floods or earthquakes. However, the recurring nature of extreme heat—and its high mortality rate among outdoor workers and slum dwellers—has forced a reconsideration of what constitutes a “disaster.”
The use of personal diaries as a data source is a response to the limitations of traditional sensors. While weather stations provide accurate readings for a specific coordinate, they do not capture the thermal experience of a person living under a tin roof in a crowded alleyway. The “slum diaries” provide the qualitative evidence necessary to prove that the “felt temperature” in these areas is often far more lethal than the official record suggests.
What to Watch Next
The success of this initiative will be measured by whether these personal testimonies translate into tangible policy changes. Observers and advocates are watching for several key developments:
First, whether the Delhi government will integrate this hyper-local data into its Heat Action Plan (HAP). If the “slum diaries” lead to the installation of community cooling hubs or the subsidization of reflective roofing materials in informal settlements, it would mark a significant victory for evidence-based, inclusive urban planning.
Second, the project may trigger a broader conversation about “cooling rights.” As heat becomes a primary threat to life, the ability to stay cool may be framed not as a luxury, but as a fundamental human right and a public health necessity.
Finally, the scalability of this model is a point of interest. If the diary-based approach proves effective in Delhi, it could be replicated in other South Asian megacities—such as Dhaka, Karachi, or Mumbai—where millions of people live in similar conditions of vulnerability.
Conclusion
The struggle of residents like Gulshan underscores a grim reality: for the urban poor, climate change is not a future threat, but a daily battle for survival. The effort to document these experiences through slum diaries is an attempt to make the invisible visible, forcing policymakers to acknowledge that the most dangerous temperatures are not found at the weather station, but inside the walls of the city’s most neglected homes. By centering the voices of the vulnerable, the project seeks to ensure that the city’s disaster protections are built for everyone, not just those who can afford to turn on the air conditioning.
Sources:
Guardian International: https://www.theguardian.com/global-development/2026/aug/17/india-disasters-heatwaves-slum-diaries-delhi-vulnerable-temperatures
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Story synopsis gathered from: Guardian International — source
