Heat, Inequality, and the ‘Right to Cool’

As extreme heat tightens its grip on Indian cities, it is also sharpening the contours of urban inequality. Thermometers routinely breach 44°C in multiple metros, and during the late-April 2026 heatwave, India reportedly accounted for 95 of the 100 hottest cities worldwide. Heat, once considered a background climate stressor, is now a frontline crisis—one that maps neatly onto class, caste, labour, and land.

Where you live decides how hot you feel

Not all neighbourhoods warm the same. Densely packed informal settlements, areas with sparse trees, and homes built from heat-trapping materials bear the brunt. Meanwhile, those with insulated housing, stable electricity, and air-conditioning can retreat indoors. Public commons—parks, lakes, shaded streets—once offered low-cost refuge. But rapid urbanisation has consumed and paved over many of these lifelines, amplifying the urban heat island effect.

Urban form is a key culprit. Approximately 60 percent of the temperature increase in Indian cities is linked to the spread of concrete and asphalt, reflective glass, and metal roofs—surfaces that soak up and radiate heat long after sunset. Night-time land surface temperatures in Indian cities have been climbing by about 0.53°C per decade, a trend worsened by a weakening monsoon rhythm and prolonged high-heat periods associated with recent El Niño conditions.

Heat on the job: the city’s invisible burden

Look at heat through the lens of labour and the inequalities sharpen further. Street vendors, delivery riders, sanitation workers, construction crews, domestic and waste workers, and peri-urban agricultural labourers often work outdoors or in semi-enclosed spaces that trap warmth. Heat advisories urging people to avoid the midday sun rarely apply to those who lose income the moment they pause. For many, skipping peak heat hours jeopardises daily wages, employment, and food on the table.

The economic toll is immense. In 2024 alone, India is estimated to have lost about 247 billion labour hours to heat, translating into roughly US$194 billion in losses. Women in heat-vulnerable areas report fatigue, dizziness, dehydration, and gastrointestinal ailments that cut into earnings during the summer months of April to June.

Cooling divides: who buys relief, and who pays the price

Cooling technologies deepen the inequality they aim to fix. Air conditioners remain unaffordable for many and expensive to run—low-income households may spend as much as 8 percent of their budget on cooling, nudging them toward energy poverty. At the same time, AC condensers vent heat outdoors, intensifying street-level temperatures, particularly in dense settlements that abut affluent enclaves. The result is a segregated atmosphere where relief is purchased privately while the thermal burden is socialised.

These patterns aren’t uniquely Indian. In Phoenix, Hispanic-majority neighbourhoods are measured to be several degrees hotter than leafier suburbs, while parts of Santiago’s peripheries, home to migrant workers, also face heightened heat vulnerability. But India’s scale—and its vast informal workforce—makes the stakes especially high.

City snapshots: how heat clusters

In Mumbai, a mere two kilometres can mean a 5.6°C difference: Dharavi’s mean land surface temperature hovers around 35.9°C compared to 30.3°C in nearby Matunga. Roughly 37 percent of Mumbai households have tin roofs that trap radiant heat, pushing indoor temperatures past 40°C during peaks. In the M/East Ward, proximity to the Deonar landfill compounds exposure for already marginalised residents. In Ahmedabad, slum surveys have found that 85.5 percent of sampled households endure significantly higher heat than those in non-slum areas.

Beyond technocratic fixes

Cool roofs, heat action plans, and early warnings save lives, but they are not enough if they ignore labour realities and spatial inequities. Heat risk is entangled with water stress, air pollution, and precarious housing. As green cover shrinks and impermeable surfaces proliferate, groundwater declines, flooding intensifies, and heat inversions trap pollutants. For households without insulation, cross-ventilation, or reliable electricity, each of these crises compounds the others. Treating them separately only misdiagnoses the problem.

A new urban compact for a hotter century

Indian cities need an Integrated Urban Climate Resilience approach—one that treats cooling, stormwater management, urban greening, air quality, and housing upgrades as interdependent goals. Some global cities demonstrate what’s possible when ecological infrastructure is planned as a system: urban forests, linear parks, shaded corridors, and restored waterways can cool neighbourhoods, manage floods, boost biodiversity, and improve public health together. The lesson is clear: blue–green infrastructure must be recognised as critical climate hardware in master plans and municipal budgets, protected from encroachment and speculative development.

Centering the ‘right to cool’ in policy

Heat Action Plans should explicitly safeguard outdoor and informal workers by:

• Mandating shaded rest areas, potable water, and first-aid at worksites;
• Requiring flexible hours and task-shifting away from peak heat;
• Providing health coverage for heat-related illness and injury;
• Guaranteeing income protection when advisories restrict work;
• Expanding access to reflective and insulated roofing, cool pavements, and community cooling centres in high-risk wards.

Equity-focused greening is equally vital: prioritise tree-canopy expansion in heat hotspots, restore lakes and wetlands for microclimate cooling, and redesign streets with permeable surfaces and continuous shade. Drinking-water points, misting stations, and shaded transit stops should be treated as essential public services during heat season.

From emergency to entitlement

The heat crisis exposes who cities have been built for—and who they have left outside. If safety from lethal temperatures depends on income and property, cities cannot claim to be inclusive. A fair social contract in a warming world affirms cooling as a basic urban service. For the millions who keep India’s cities running, the ‘right to cool’ is not a slogan; it is the difference between coping and collapsing in the hottest hours of the day.