The Report — What Was Released and When

Almost 76 per cent of the national capital is persistently heat-stressed, a condition worsened by the dramatic shrinking of the city’s green cover, according to a new report released by Delhi-based think tank Centre for Science and Environment (CSE) on June 2, 2026, to mark Global Heat Action Day.

Report: Making Delhi Heat-Resilient Released by: Centre for Science and Environment (CSE), New Delhi Date: June 2, 2026 — Global Heat Action Day

The CSE is one of India’s most respected environmental research institutions — the organisation behind India’s most authoritative annual State of the Environment reports. Making Delhi Heat-Resilient is a data-intensive geospatial study combining satellite analysis, temperature records and socioeconomic vulnerability mapping.

The Green Cover Collapse — The Core Finding

Delhi’s green cover has shrunk from 25.36 per cent in 2014 to 14.14 per cent in 2024, while waterbody coverage has declined from 1.25 per cent to 0.99 per cent over the same period.

Delhi lost nearly half its green cover in a single decade. This is not a slow, gradual process — it is a rapid, accelerating dismantlement of the city’s natural cooling infrastructure through urbanisation, construction, road expansion and encroachment on forest land.

Researchers noted that vegetation can reduce ambient temperatures by as much as 5.7°C, while water bodies can cool surrounding areas by up to 5°C. Dense tree canopies are particularly effective, with previous studies showing they can lower land surface temperatures by around 10°C compared to sparsely vegetated areas.

By losing half its green cover, Delhi has effectively dismantled a distributed, free, renewable air-conditioning system — and replaced it with concrete, asphalt and glass.

The Heat Reality — 76% of Delhi Is Persistently Heat-Stressed

Nearly 99% of Delhi crossed the heat-stress threshold at least once between 2015 and 2024, with over 75% of the city persistently heat-stressed.

“Persistently heat-stressed” means these areas experience dangerous heat conditions repeatedly across multiple years — not just during extreme heatwaves, but as a chronic, recurring condition.

The Yamuna River remains one of the city’s few exceptions. The Yamuna River remains one of Delhi’s few major heat-relief corridors, with areas around the river recording significantly lower surface temperatures.

Surface Temperature — The 60°C Reality

While most people track air temperature (the figure reported by IMD), surface temperature — the temperature of the ground, roads and rooftops — tells a more alarming story.

According to satellite data included in the ‘Delhi Heat Action Plan 2026’ prepared by the Delhi State Disaster Management Authority (DDMA), the capital city’s land surface temperature has also surpassed dangerous levels, breaching the 60 degrees Celsius mark. Thermal data from NASA’s Landsat 8 satellite show that while the maximum air temperature in Delhi on one extreme day was recorded at 48 degrees Celsius, the ground surface temperature in some residential and industrial areas stood at dangerous levels. The highest ground temperature was recorded at 60.48 degrees Celsius in Narela, followed by 59.06 degrees Celsius in Najafgarh.

A surface at 60°C causes immediate burns on contact. Children, elderly people, outdoor workers and street vendors who work or rest on Delhi’s roads, footpaths and open grounds are exposed to these temperatures every summer — invisible in official temperature data, but felt in hospitals.

The Hottest Night in 14 Years — Night Temperatures Aren’t Falling

Delhi recorded its warmest night in 14 years on May 25, 2026. On this day, the minimum temperature touched 32.4°C despite daytime temperatures remaining above 40°C for much of the month.

Delhi’s night-time cooling ability declined by 9%.

A minimum temperature of 32.4°C at night means the city never cooled below 32°C all night. For people without air-conditioning — the majority of Delhi’s population — this is not just uncomfortable. It is physiologically dangerous. The human body needs night-time temperature relief to recover from daytime heat stress. When nights stay this warm, cumulative heat stress builds day by day.

The report linked rising nighttime temperatures to rapid urbanisation, shrinking green and blue spaces, dense built-up areas, inadequate ventilation and increasing dependence on air-conditioners.

The Air Conditioner Trap — How Cooling Is Making Delhi Hotter

Delhi’s peak power demand recently reached a high of 8,231 MW. The rise in AC use strains the energy systems and aggravates the urban heat island effect. A running AC ejects heat into the ambient environment and heats up the airshed of those who rely on the outdoor environment for cooling. “Essentially, it spurs cooling inequity,” says the report.

CSE noted that AC ownership has tripled over the past decade and that cooling appliances eject waste heat into the surrounding environment, intensifying the urban heat island effect and pushing temperatures higher, particularly at night.

The feedback loop is vicious:

1. Green cover falls → temperatures rise
2. Temperatures rise → more people buy ACs
3. More ACs → more waste heat ejected outdoors
4. More outdoor heat → nights stay warmer
5. Warmer nights → more AC needed
6. More electricity demand → more power plant emissions → more warming

The people trapped in this loop are the ones who cannot afford an AC — the construction workers, rickshaw pullers, vegetable vendors and chowkidars who live and work outdoors in Delhi’s hottest zones.

Who Is Most Vulnerable? — The Heat Justice Crisis

“Current actions to contain this crisis are proving to be insufficient because of a lack of a targeted resilience strategy for highly vulnerable groups such as construction workers, street vendors and informal settlement dwellers, many of whom reside or work in heat hotspots,” the CSE report stated.

Most construction sites and markets are located in recurring heat-stress zones, exposing workers and low-income communities to greater risks.

The geography of heat stress in Delhi is not random — it follows socioeconomic geography. The areas with the least green cover, highest concrete density and highest surface temperatures are also often the areas where Delhi’s poorest and most vulnerable residents live and work.

The Economic Cost — $100 Billion and Rising

India is estimated to lose over $100 billion annually due to heat-related declines in labour productivity and disruptions to economic activity. Productivity can decline by 2–3% for every degree rise above optimal levels.

For Delhi specifically, the economic cost of heat manifests in:

• Lost productive work hours for outdoor workers (peak summer months see 20–30% productivity decline)
• Healthcare costs for heat-related illness
• Infrastructure damage from extreme heat (road surfaces buckling, power grid strain)
• Reduced outdoor commercial activity

Solutions — What the CSE and DDMA Recommend

CSE’s Dual-Strategy Roadmap:

Strategy 1 — Restore Nature:

• Urgent reversal of green cover loss — tree planting, urban forests, roadside vegetation
• Restore and protect Delhi’s waterbodies — Yamuna floodplains, lakes, wetlands
• Prioritise green infrastructure in all new construction approvals

Strategy 2 — Build Resilience:

• Public cooling centres (similar to “heat shelters” operated in US and European cities)
• Early warning systems for vulnerable populations (construction workers, street vendors)
• Climate-sensitive urban planning — cool corridors, shaded walkways
• Cool roofs and high-albedo surfaces

DDMA’s Delhi Heat Action Plan 2026 — Specific Measures:

The Delhi Heat Action Plan 2026 recommends applying high-albedo or extremely white paint or coating to roofs of homes and buildings to reflect sunlight. Another low-cost solution, especially in poorer neighbourhoods, is to place wet sacks or white tarpaulins on tin or asbestos roofs. Instead of concrete or bitumen, light colored materials and interlocking tiles should be used in construction of roads and footpaths, as these absorb less solar radiation. Growing vines and plants on the exterior walls of multi-story concrete buildings is also recommended to protect from direct sunlight.

The Bigger Picture — What This Connects To

This crisis does not exist in isolation. It is directly connected to stories delhincrtimes.com has covered this week:

• Delhi’s dust-free roads green makeover — the green central verge push is literally a response to this green cover crisis
• Delhi’s 5 corridor pedestrian-friendly plan — trees, shade and green corridors are the answer to heat stress on pedestrian routes
• Delhi’s heatwave and temperature drop — the Western Disturbance that brought relief on May 28 is exactly the kind of event that becomes more extreme as urban heat islands intensify
• Delhi rainwater harvesting mandate — protecting waterbodies (which cool surrounding areas by 5°C) is directly linked to the heat crisis