Heat waves and rising temperatures are increasingly affecting working environments, especially those already exposed to heat sources. Although French law does not set a precise threshold for maximum temperatures in the workplace, standards and recommendations exist to provide a framework for thermal safety and prevent the dangers associated with excessive heat. This article explores regulations, employers’ obligations and employees’ rights with regard to thermal conditions, as well as health risks.
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Workplace temperature regulations and recommendations
No precise legal threshold
In France, there are no specific regulations imposing a maximum temperature threshold in the workplace. Article R4223-13 of the French Labor Code stipulates that the employer must “ensure the safety and protect the health of workers”, but does not define a temperature limit that must not be exceeded. The law therefore does not specify strict values, leaving it up to employers to ensure safe working conditions according to the characteristics of their environment.
Although legislation does not set maximum temperatures, there are a number of standards and recommendations to guide employers’ heat management practices.
Existing standards and recommendations
ISO 7730 standard
The ISO 7730 standard, which applies to the design of premises, defines thermal comfort conditions in indoor environments. Its recommendations are as follows:
- 20 and 22 degrees in an office ;
- 16 to 18 degrees in a workshop with average physical activity;
- 14 to 16 degrees for sustained physical activity.
These temperature ranges are considered optimal for ensuring thermal comfort without disrupting employee productivity. These recommendations apply mainly to air-conditioned or well-ventilated environments.
INRS recommendations
The French National Institute for Research and Safety (INRS) recommends keeping the ambient temperature in a work environment at a level where health risks are minimized. According to INRS, dangers are increased when the ambient temperature exceeds 30°C for a sedentary employee, and 28°C for physical work. Above 33°C, the dangers of heat stroke and dehydration increase considerably, and preventive measures need to be put in place as a matter of urgency.
Employer’s thermal safety obligations
Employers have aduty to ensure the health and safety of their employees, including heat management. He must assess thermal risks by identifying situations where temperatures may represent a health hazard for his workers. This assessment must take into account ambient temperature, humidity, the type of work performed, and the duration of exposure to heat. The assessment must also consider the effects of heat in combination with other factors such as the physical workload, the equipment used, and work clothing. The employer must use suitable tools such as thermometers and hygrometers, and in the case of complex conditions, call in medical experts. Once the assessment has been carried out, preventive measures must be put in placeto limit employee exposure to hazardous conditions, in accordance with article L.4121-1 of the French Labour Code.
Preventive measures to be implemented
- Flexible working hours
One of the first things to consider when faced with hot weather is adapting working hours. It may be necessary to shift work to the cooler hours, such as early morning or evening. Regular breaks should also be introduced to allow employees to rest and rehydrate. In addition, outdoor workstations must be designed to provide adequate protection against extreme weather conditions, in accordance with article R. 4225-1 of the French Labor Code.
- Supply of fresh drinking water
In accordance with article R. 4225-2 of the French Labor Code, access to fresh drinking water must be guaranteed for all employees. Theemployer is obliged to provide sufficientwater to prevent dehydration, especially in environments where workers are physically active or in confined spaces.
- Ventilation and air conditioning
In accordance with Article R. 4222-1 of the French Labor Code, the employer must guarantee adequate air renewal in premises to avoid excessive temperature rises. In spaces where pollution is not specific, this renewal can be achieved by mechanical ventilation (controlled mechanical ventilation, for example) or natural ventilation (through windows, openings, etc.) (Article R. 4222-4). In environments where heat is difficult to manage, such as workshops or factories, the installation of ventilation or air-conditioning systems may be essential to maintain a safe and pleasant temperature. In large, open industrial spaces, adiabatic cooling can be an effective alternative for ensuring suitable, standard-compliant working conditions.
Employee rights in high temperatures
Conditions for exercising the right of withdrawal
The right of withdrawal allows an employee to leave his or her workstation in the event of serious and imminent danger to health, in accordance with articles L.4131-1 to L.4131-4 of the French Labor Code. In the event of extreme heat, if a worker considers that exposure to heat is likely to cause immediate harm (heat stroke, for example), he or she may leave his or her workstation. This right must be exercised within a specific framework, and theemployer must be informed immediately.
Procedure in the event of serious and imminent danger
When an employee exercises his right of withdrawal, he must follow a specific procedure:
- Immediately inform your supervisor of the danger.
- Justify its withdrawal by explaining the risk involved.
- Document the incident in the event of a dispute.
If theemployer fails to take appropriate action to correct the situation, the employee may decide to leave the workplace without risk of sanctions. Exercising the right of withdrawal must not give rise to any sanction or salary deduction. Employees are free to exercise this right at their own discretion. On the other hand, when the employee’s life or health is not really in danger, he or she may be penalized.
Effects of hot weather on workers’ health
Risks involved
Heatstroke, dehydration, muscle cramps and fatigue are major risks in high temperatures. These phenomena can lead to serious bodily failure and, in some cases, hospitalization. Heatstroke, in particular, is a medical emergency with potentially fatal consequences if the situation is not rapidly addressed.
In addition, heat can aggravate pre-existing pathologies, notably cardio-respiratory, renal and endocrine. It can also impact on physical performance and safety, for example by making it difficult to use tools due to clammy hands, as well as causing psychological effects such as longer reaction times or errors and omissions.
Warning signs and personal prevention
Warning signs of heat problems include headaches, dizziness, nausea and excessive sweating. Employees must be trained to recognize these signs and react quickly. Individual preventive measures, such as wearing light, breathable clothing, taking regular breaks and drinking water, are also important to avoid heat-related hazards.
Specific regulations and appropriate measures
Provisions for the construction industry
Construction workers, especially those working outdoors during the summer, are highly exposed to the risks associated with heat and heatwaves. To limit these risks, regular breaks must be taken, and air-conditioned shelters or shaded areas provided, in accordance with article R. 4534-142 of the French Labor Code. In addition, access to at least 3 liters of water per day per worker is mandatory (article R. 4534-143). Flexible working hours can also be arranged to avoid the hottest periods of the day. In the event of extreme conditions, the employer can temporarily suspend work.
Young workers
French legislation pays special attention to young people under 18, who are subject to restrictions on working outdoors in hot weather. Because of their heightened sensitivity to heat, they benefit from special protection. Exposure to extreme temperatures likely to damage their health is prohibited (Article D. 4153-36). Their state of health must be closely monitored, and their tasks adapted to avoid heat overload.
