When The Sky Becomes a Furnace

SKY BECOMES A FURNACE Ramesh Yadav does not own a thermometer. He does not need one. After eighteen years of laying bricks under the Delhi sky, his body has become its own instrument — sweat arriving before eight in the morning, vision beginning to swim by noon, the particular throb behind the eyes that tells him the air has crossed forty-five degrees. "When the ground burns through your sandals," he says, pressing a cracked palm to his cheek, "you already know."

Yadav, 44, migrated from Sitapur in Uttar Pradesh two decades ago. He sends ₹8,000 home every month. He cannot afford to stop working. This May, as Delhi recorded its hottest spell since meteorological records began — with the mercury touching 49 degrees Celsius in Mungeshpur — men like Yadav kept climbing scaffolding, breaking asphalt, and carrying head-loads of sand across construction sites that shimmered like mirages.

"If I sit down to rest, the contractor docks my pay. If I drink too much water, I need the toilet and there is no toilet. So I just keep going." — Deepak Sahu, road worker, Outer Ring Road

THE BODY UNDER SIEGE

The human body begins to struggle when the core temperature climbs above 38°C. At 40°C, heat exhaustion sets in — nausea, weakness, the sensation of the world tilting. At 41°C, heatstroke: organ failure, confusion, death. A labourer in Delhi this summer is not working near these thresholds. He is working in an environment where the air itself is already 46 degrees, the road surface beneath his feet exceeds 60, and the relative humidity on some days pushes the apparent temperature — what the body actually feels — beyond 55°C.

Dr Suresh Kumar, medical director at Delhi government's Lok Nayak Hospital, has observed the toll first-hand. "Delhi is seeing a prolonged heatwave and people who have to stay out for longer durations are at a greater risk of developing symptoms such as fatigue, dizziness and heat stroke," he said. The patients filling his wards are not the elderly or the infirm — they are working adults, in the prime of their lives, felled by the cumulative weight of an outdoor shift in a city that has become, by degrees, uninhabitable in summer.

A senior doctor at Kasturba Gandhi Hospital in Daryaganj noted something that rarely makes headlines: many women construction workers and labourers do not drink water despite the heat because they have no access to toilets. "Heat impact is not just limited to heat strokes or dizziness, but also causes urinary tract infections, severe muscular cramps and rashes, among other ailments."

India's economic vulnerability to heat is acute because a large share of its workforce depends on outdoor, heat-exposed occupations — construction, transport, sanitation, and street vending. Rising temperatures slow physical work, reduce productivity, and threaten incomes.

VOICES FROM THE GROUND

Sunita Devi sells water pouches outside Shadipur metro station. By 10 a.m. she has already drunk three litres herself, which she will not count against her profit because she long ago stopped thinking of her own body as a cost centre. Her customers — labourers, auto-rickshaw drivers, domestic workers — hand over two-rupee coins with hands so chapped they look split. She watches them drink standing up, in movement, always in movement, because stillness costs money none of them have.

At a construction site in Dwarka, where a residential tower is rising twelve floors above the Haryana flatlands, the contractor Vinod Singh has put up a single water cooler and a tarpaulin that provides shade to approximately eight of the sixty workers on site. "Government says to give shade and water," he says, without particular embarrassment. "I give shade and water." He gestures at the blue tarpaulin. He does not mention that the ILO recommends a fifteen-minute break every hour for outdoor workers in temperatures above 43°C. On this site, breaks are self-administered: a man either stops, or he does not.

"My husband collapsed last June. The contractor called it 'weakness.' No ambulance, no compensation. Just: take him home and come back when he is better." — Kamla, wife of a construction worker, Badarpur

THE POLICY GAP

India's Occupational Safety, Health and Working Conditions Code of 2020 mandates restrooms, adequate drinking water, and shade for outdoor workers. Delhi's Heat Action Plan calls for restrictions on outdoor work during peak heat hours, and employers are encouraged to reschedule outdoor work during those periods. The plan prioritises outdoor workers as an at-risk group and includes public awareness initiatives such as hoardings, street plays, and community radio broadcasts.

Yet on the afternoon this reporter visited three separate construction sites — all on a day when the IMD had issued a red alert — the total number of workers resting during the restricted hours was zero.

Enforcement, say labour activists, is structurally impossible in a sector where most workers are informal, most contractors are sub-contracted through layers of intermediaries, and most worksites have no fixed address that an inspector can return to. "The inspection system was built for factories," says Anuradha Mishra of the construction workers' union Jan Sangharsh Manch. "It was never designed for a city that builds itself on the backs of people who have no contracts, no identity cards at work, and no knowledge that any of these rules exist."

A SEASON WITHOUT END

The HeatWatch dataset recorded over 2,000 suspected heatstroke cases across northern and eastern India in a single season, while the National Centre for Disease Control reported more than 7,000 suspected cases in the first half of 2025 alone — with deaths widely believed to be vastly undercounted.

Climatologists project that Delhi will experience conditions that currently qualify as extreme — temperatures above 45°C — for roughly twice as many days per year by mid-century. The city is also caught in a deepening urban heat island effect: the concrete and asphalt that labourers build absorb and re-radiate heat, ensuring that even nights no longer offer full recovery. Workers who sleep in the open, or in tin-roofed jhuggi clusters where nighttime temperatures remain above 35°C, begin each morning's work physiologically depleted.

Ramesh Yadav does not follow climate projections. But he has noticed, year on year, that what he calls "the killing months" have lengthened. April used to offer some mercy in the early weeks. Not anymore. "Now it is March to October," he says, in the matter-of-fact tone of someone reporting the hours of a shop. "Eight months of this. Before, it was maybe five."

He finishes his chai — the small paper cup balanced on the ledge of a half-built wall — and sets it down with surprising gentleness. Above him, the sky is white with heat. Below, the city he is building offers him no shade.

He picks up his trowel and goes back to work.