Slow-Burning Furnace: India's Garment Workers Are Absorbing a Crisis Not Theirs

Inside garment factories, the danger from heat does not arise from temperature alone. It emerges when rising temperatures meet a work system that gives workers almost no room to respond. The body cools itself through a narrow set of behaviours—drinking water, resting, slowing pace, accessing sanitation. In a factory running on piece-rate targets, each of those behaviours carries a cost.

Survey findings illustrate how widespread these pressures are. 78.3% of workers report that workstation heat is intense enough to make them feel physically unwell—not occasionally, but as a recurring experience through the summer months as factory interiors grow progressively hotter across the shift. For most, the symptoms that follow are equally familiar. Around 87% report experiencing dizziness, headaches, or muscle cramps within the preceding twelve months—the classic signs of a body that is overheating and cannot recover. By the end of the working day during peak summer months, 87.8% report feeling completely drained.

The production floor leaves limited room for adjustment. 68.7% of workers say heat directly affects their ability to work. Yet the structure of garment manufacturing—output quotas, piece-rate wages, fixed break schedules—means that slowing down costs money—immediately. Around 78% of workers report skipping breaks even when they feel hot or tired, because falling behind on targets risks lost earnings or reprimands from supervisors. The study found that workers who skip breaks carry nearly double the heat stress scores of those who do not.

Water and sanitation access compound the problem further. 36.5% of workers report that drinking water on the factory floor is either unreliable or of poor quality. More critically, restricted toilet access leads many workers to deliberately reduce how much they drink during the workday—a pattern described in the study as voluntary dehydration, driven not by choice but by the arithmetic of the production floor. The study assigned sanitation the heaviest weighting in its Heat Stress Index, at 34.6% of the total score, because toilet restriction is the mechanism through which heat management most consistently breaks down.

The health consequences extend beyond acute symptoms. 96.8% of female workers reported a burning sensation during urination. 45% reported amber to brown urine—a clinical indicator of dehydration and potential kidney strain. These are not isolated complaints. They are what happens when workers spend summer after summer unable to drink enough water on the job.

Heat stress in garment manufacturing is therefore shaped as much by production discipline and workplace controls as by the surrounding climate. The temperature outside sets the baseline. The work system determines how dangerous it becomes.

The physical structure of garment factories does not simply fail to protect workers from heat. In many cases, it actively generates it.

Among the 15 garment and textile units surveyed by HeatWatch-TISS across Tamil Nadu, Delhi-NCR, and Gujarat, 73.3% have roofs made of metal or asbestos—materials that absorb solar radiation through the day and radiate it downward into the production floor below. In densely packed halls where ventilation is limited, the heat builds steadily through the shift, with nowhere to go. Fans, present at 84.3% of workstations, offer limited relief: 80% of workers report no air movement at their workstations, with the air feeling hot and stuffy—a sign that in environments dense with machinery, fans recirculate heat rather than dispel it.

Industrial equipment adds further thermal load. Jet dyeing machines operate at 125–130°C. Fusing presses, steam irons, and boilers run continuously across production floors where workers are stationed for full shifts. In some textile and dyeing units, indoor temperatures exceed 45–50°C—levels that far outstrip typical outdoor conditions and place workers under sustained physiological strain with few practical means of individual relief.

The productivity consequences are measurable. A multi-year study across more than 58,000 Indian manufacturing plants found that each 1°C rise in annual average temperature corresponds to roughly a 2% decline in company revenue. At the factory level, separate research found that worker productivity falls approximately 3% for every 1°C increase in workplace temperature. One factory manager surveyed for the HeatWatch-TISS report described it in plainer terms: in summer, workers take four to five times more breaks than in winter, compressing a nominally eight-hour shift into five or six hours of effective output.

Despite this, systematic monitoring remains limited. Seven of the 15 factories surveyed have no devices to measure temperature or humidity. Of the eight that do, none use those readings to modify work schedules or production targets. In four of the seven units that do have sensors, workers report that devices are activated only during buyer visits or compliance inspections—useful for audits, irrelevant to workers.

The economics of the supply chain help explain the gap. Smaller suppliers, absorbing cost pressures passed down from brands, have limited capital for retrofitting. Cooling infrastructure—insulated roofing, active ventilation, evaporative systems—requires upfront investment that thin margins and fast-fashion pricing structures do not encourage. The thermal burden created by factory architecture and industrial machinery therefore remains largely unaddressed, turning climate heat into a concentrated occupational hazard that the industry has so far treated as the worker's problem to bear.

Labour Law Has Not Caught Up

Extreme heat now exposes a regulatory gap between climate policy and labour protection. India's climate frameworks rarely address indoor industrial heat, while labour regulations emphasise space standards and welfare provisions without accounting for thermal safety. As temperatures continue to rise, the burden of adaptation falls not on factories or supply chains but on workers' bodies. The future of garment manufacturing may hinge as much on how factories govern heat as on what happens to the climate outside.