Air‑conditioning health risks rise in France during heatwaves

Health experts warn that prolonged use of air‑conditioning during summer heatwaves can irritate the upper‑respiratory tract. Cooling systems lower indoor humidity, often below the recommended 40‑60 % range, drying the mucous membranes of the nose, throat and eyes. Sudden temperature drops can cause thermal shock, leading to headaches, shivers and increased susceptibility to sinusitis, rhinitis, conjunctivitis and throat irritation. Poorly maintained units may also disperse dust, mould spores and other allergens.

To minimise these effects, doctors advise moderate indoor temperatures, regular filter cleaning, and ensuring adequate ventilation by opening windows for short periods each morning and evening. Maintaining personal hydration and avoiding extreme temperature contrasts between outdoor and indoor environments are also recommended.