The Heat is On – At Some Workplaces: Evidence from Incident-Level Hungarian Work Accident Register DO NOT DISTRIBUTE - PRELIMINARY
This study utilizes Hungarian incident-level data to demonstrate that rising temperatures significantly increase workplace accident risks, particularly for temporary and part-time workers in diverse sectors beyond traditional outdoor industries, while also revealing a cumulative effect of heat fatigue over the course of a shift.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Heat is more than just an uncomfortable feeling; it is a physical force that can quietly erode a person's ability to think clearly and move safely. When the air grows warm, the human body works harder to cool itself, diverting energy away from the brain and muscles. This biological reality means that as temperatures rise, the likelihood of making a mistake increases, whether one is operating heavy machinery or simply walking across a busy office floor. While this connection between heat and danger is well known for outdoor laborers, such as farmers and construction workers, a significant gap remained in our understanding of how heat affects the vast majority of people who work indoors or in service roles. Until recently, there was little hard data from Central and Eastern Europe to show whether rising global temperatures were making everyday workplaces more dangerous for everyone, or just for those working under the open sky.
Researchers at the Joint Research Centre of the European Commission set out to fill this gap by turning their attention to Hungary, a country that maintains exceptionally detailed records of workplace accidents. Instead of relying on broad summaries or general estimates, the team accessed a massive database containing over 130,000 specific incident reports from between 2016 and 2021. They then matched each of these accidents with precise, hour-by-hour temperature data for the specific region where the event occurred. By linking the exact moment a worker was hurt with the exact temperature at that time, the scientists could move beyond guesswork and measure the direct relationship between heat and safety. They looked for patterns in how often accidents happened as the temperature rose above the normal range for that time of year, while also accounting for the type of job, the worker's contract status, and how long they had been on the clock.
The results confirmed a clear and worrying trend: as temperatures climbed above 20 degrees Celsius, the risk of a workplace accident increased significantly. For every degree the temperature rose above this threshold, the rate of accidents went up by a measurable amount. This finding held true even after the researchers accounted for other factors, proving that the heat itself was driving the danger. Interestingly, the study found that cold temperatures did not have a similar effect; the risk only spiked when it got hot. This suggests that the human body's struggle to cope with warmth is a specific trigger for errors, rather than a general reaction to uncomfortable weather.
Perhaps the most surprising discovery was that this danger is not limited to traditional outdoor industries. While sectors like mining and construction showed the highest overall risk, as expected, the study revealed that heat also makes workers in arts, professional services, and administrative roles significantly more prone to accidents. This challenges the common assumption that indoor, climate-controlled environments offer complete protection. The data indicates that even in offices and service centers, where workers might not be sweating under the sun, the heat is still affecting their focus and coordination enough to cause incidents. The risk appears to be driven by a combination of physical strain and mental fatigue, which can strike anyone whose job requires concentration, regardless of whether they are wearing a hard hat or a suit.
The study also uncovered that the burden of this heat stress is not shared equally among all workers. Those with less secure employment, such as temporary staff and part-time employees, faced a much higher risk of heat-related accidents compared to their permanent, full-time colleagues. This disparity suggests that job insecurity may correlate with fewer safety protections, less access to cooling measures, or less freedom to take necessary breaks when the temperature rises. Furthermore, the timing of the workday played a crucial role. The risk of an accident did not stay constant throughout the day; instead, it grew steadily as the shift progressed. By the tenth hour of work, the danger was at its peak, indicating that the cumulative effect of heat and fatigue makes the end of a long shift a particularly vulnerable time for workers.
These findings paint a picture of a workplace environment that is becoming increasingly hazardous as the climate warms. The evidence shows that heat is a silent, stratified threat that affects everyone from the construction site to the corporate office, but hits the most vulnerable workers the hardest. The research suggests that current safety rules, which often focus only on extreme heatwaves or outdoor labor, are no longer sufficient. To keep workers safe, policies will need to adapt to protect temporary staff, extend heat protocols to service industries, and manage work schedules to account for the fact that fatigue builds up as the day gets hotter. Without these changes, the rising temperatures of the future promise to make the workplace a more dangerous place for millions of people.
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