Workplace Heat Study Reveals Accident Spike at 30°C and a Hard Ceiling at 38.5°C Core Temperature

A joint investigation by the Vienna Chamber of Labour (AK Wien) and the Medical University of Vienna, released Monday, draws on more than 17,000 individual calculations to map how heat erodes safety and productivity on the job. The findings are stark: mental performance starts to slip at 27°C, and once the thermometer hits 30°C the chance of a workplace accident jumps by seven percent.

The researchers set a firm physiological red line. When a worker’s core body temperature reaches 38.5°C, they say, the shift must stop immediately. Outdoors under extreme heat, safe work intervals shrink to just 15 to 20 minutes. The team also developed a planning model that links official heat warning levels with actual physical strain, using a metric called predicted heat stress.

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Despite the documented risks, German labour law does not grant employees a general right to “heat-free” time. Employers are obliged under occupational safety regulations to provide tolerable conditions, and a specific heat protection ordinance has been in force since the beginning of 2026. But the AK Wien argues that is not enough. It is calling for legally binding exposure limits and mandatory rules for indoor spaces—especially hospitals, nursing homes, and schools. The chamber also wants compulsory measurement of the wet-bulb globe temperature, a more precise gauge of heat stress than air temperature alone. The Austrian Trade Union Federation (ÖGB) backs the demands and has launched an online survey to capture current heat loads.

Separately, the German Social Accident Insurance (DGUV) used Thursday’s nationwide heat action day to spotlight the symptoms of acute heat exhaustion: cold, clammy skin, a racing pulse, muscle cramps, nausea, and headache. Without immediate cooling and electrolyte drinks, the condition can escalate into heatstroke, risking organ and brain damage.

Beyond immediate emergencies, long-term consequences are mounting. Germany’s occupational disease statistics already list 51 recognised cases of UV-induced white-skin cancer, prompting employee representatives to push for stronger prevention measures for outdoor workers.

The heat-protection debate overlaps with a broader fight over working-time reform. On Sunday, conservative politician Christoph Ploß called for scrapping the eight-hour day in favour of a weekly maximum. Unions reacted furiously. DGB chairwoman Yasmin Fahimi described the plan on Monday as a social step backwards, warning it could allow shifts of up to 13 hours.

The coalition committee is set to meet on Wednesday with business and union representatives at the chancellery, with pension policy and the eight-hour day on the agenda. Labour Minister Bärbel Bas has promised to table a draft bill by June.

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