Working During a Heatwave: Natural Ways to Cope Better

Heatwaves at work refer to periods of prolonged exposure to very high temperatures during working hours. Unlike an isolated hot day, a heatwave is a period of unusually hot weather that countries may identify through official weather warnings. These conditions can pose significant health risks to workers.

Working in extreme heat can have a range of adverse health effects, from dehydration to potentially life-threatening heatstroke. Heatwaves can affect workers across all sectors, particularly those working outdoors, such as in construction or agriculture, as well as those working indoors in poorly ventilated or inadequately cooled premises.

Good to Know: Legal requirements for working in extreme heat vary between countries. Some countries set specific temperature thresholds, while others focus on employers’ obligations to assess and prevent heat-related risks. For example, in France, no legal maximum temperature automatically prohibits work, but employers must assess and prevent heat-related risks. This regulatory framework was strengthened by Decree No. 2025-482 of 27 May 2025, which sets out specific prevention obligations in this area.

Climatic and Meteorological Factors

The main cause of heat stress at work is a significant and prolonged rise in ambient temperature, particularly during heatwaves. When temperatures exceed local thresholds, such as those set by Météo France, they pose health risks to workers, especially during orange and red alerts.

Extreme weather conditions may also bring strong solar radiation and fluctuating humidity levels. These conditions make it even more difficult to regulate body temperature.

An Unsuitable Working Environment

Enclosed spaces, poor ventilation, or inadequate air-conditioning can lead to heat build-up. In France, for example, Decree No. 2025-482 of 27 May 2025 now requires that premises be maintained at a suitable temperature, taking into account the work being carried out and outdoor conditions.

Outdoors, direct exposure to the sun, particularly in the construction and agriculture sectors, significantly increases heat-related risks. The lack of shade, suitable rest areas, or regular breaks further exacerbates this risk.

Characteristics of the Workplace

Certain physical activities, particularly those requiring intense or prolonged exertion, increase the body’s internal heat production. In very hot conditions, this additional heat production can quickly exceed the body’s ability to regulate its temperature and increase the risk of heatstroke.

Personal protective equipment (PPE), which is essential in certain sectors, can also contribute to thermal discomfort, as it tends to restrict sweat evaporation and, consequently, heat dissipation.

Workers’ Health and Well-Being

Some employees, particularly the most vulnerable (the elderly, those with pre-existing medical conditions, or those taking medication), are more sensitive to the effects of heat. The decree emphasises the employer’s obligation to consider these situations and adapt preventive measures for each affected employee.

• Headaches: An early sign of dehydration and overheating that can develop into more serious conditions

• Unusual Tiredness: A feeling of intense exhaustion caused by the heat that sets in rapidly, a sign that the body is struggling to cope with the heat

• Profuse Sweating: Sweating is the body’s main cooling mechanism. In extreme heat, it can lead to severe dehydration

• Dizziness and Light-Headedness: These symptoms are linked to a drop in blood pressure caused by the heat. When blood pressure drops, this can lead to falls or fainting

• Muscle Cramps: Painful contractions caused by severe dehydration and an electrolyte imbalance

• Nausea and Vomiting: Signs that the body is suffering and can no longer cope with the heat

• Loss of Consciousness and Disorientation: Serious symptoms of heatstroke requiring immediate medical attention

• Rise in Body Temperature: Which may exceed 40°C, characteristic of heatstroke, a life-threatening emergency

These symptoms indicate the body’s inability to cope with the ambient heat. Without appropriate measures, they can quickly lead to serious complications.

Organic Aloe Vera Gel

Aloe vera gel has cooling and moisturising properties. Apply it to the face, wrists, or neck to quickly relieve the sensation of heat. Keep it in the fridge for an even more soothing effect. Recommended Usage: Apply a thin layer several times a day as needed.

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Organic Peppermint Hydrosol Mist

This mist is ideal for providing an immediate sensation of freshness. Hydrosol is an ingredient designed to be incorporated into a cosmetic formulation or a finished product. It must not be used undiluted or applied directly to the skin. Add it to your liquid formulation, then spray 2 to 3 times a day, or more as required.

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Meudon White (calcium carbonate) 500g

Traditionally used for cleaning and craft projects, it is also ideal during heatwaves: when applied to windows, it forms a temporary white film that reflects the sun’s rays and helps keep the heat out.

Discover Meudon White (calcium carbonate) 500g

Powdered Electrolytes – 200g – Food Supplement

Powdered electrolyte drink enriched with coconut water, taurine and four minerals (magnesium, potassium, calcium, zinc) for optimal hydration. It reduces fatigue, supports endurance and optimises muscle recovery. Easy to mix in your water bottle, before, during or after exercise, upon waking or when feeling tired. With no added flavourings or sweeteners, it can also be incorporated into a beauty routine or used the morning after a night out.

Discover Electrolyte Powder – 200g – Food Supplement

Organic Spirulina Powder

In hot weather, the brain receives less oxygen due to peripheral vasodilation. This shortage can lead to difficulty concentrating, impaired memory at work and a feeling of disorientation. Drinking beverages regularly enriched with a spoonful of organic spirulina powder can support brain function. Naturally rich in protein, minerals, essential fatty acids, and vitamins, spirulina is widely known for its nutritional properties.

Discover Organic Spirulina Powder

Prevention relies on a combination of organisational, technical, and individual measures, as well as the adoption of best practice.

1. Monitor the weather and anticipate heatwaves through official alerts (such as Météo-France)

2. Adjust working hours to avoid the hottest periods of the day, particularly by scheduling work early in the morning or late in the day

3. Provide sufficient quantities of cool water near workstations

4. Provide shaded areas and, where possible, air-conditioned spaces

5. Reduce strenuous physical activity and encourage employees to take frequent breaks

6. Provide suitable equipment: light clothing, sun protection, and PPE designed to minimise heat build-up

7. Inform and train employees about the risks associated with heat and the actions to take in the event of a heatwave alert

8. Take vulnerable employees into account and tailor measures to their specific needs

In certain sectors, such as the construction industry, specific rules apply, such as the suspension of work in the event of adverse weather conditions or a heatwave, following consultation with the social and economic committee.

When using natural products, follow a few simple guidelines to help maintain their quality and use them safely. Store aloe vera gel and floral waters away from heat and light. Keeping them in the fridge can also provide a refreshing, cooling effect when applied. Floral waters must not be ingested.

If irritation occurs, discontinue use. If you experience any unusual symptoms, consult a healthcare professional.

The best defence against heatwaves at work remains a rigorous approach that combines technical prevention measures with appropriate natural practices. Although natural products can improve the comfort of workers exposed to heat, just as a light meal can make the summer heat more bearable, these solutions must be part of a comprehensive risk-prevention policy.

Of course, it is essential to look out for one another and remain vigilant for the first signs of overheating.

Formerly a manager at an organic shop, Alice spent several years helping her customers choose healthy products that respect both their health and the natural world. Having suffered from endometriosis since her teenage years, she chose to prioritise natural solutions to ease her symptoms and improve her day-to-day well-being. Drawing on her knowledge of naturopathy, she has always explored the benefits of plants and nutrition. Passionate about ecology and deeply connected to nature, Alice makes her own cosmetics and household products to reduce her impact on the planet and all its inhabitants.