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Scented candles create a cosy atmosphere but release harmful pollutants. Researchers found they emit ultrafine particles, carbon monoxide, nitrogen oxides, volatile organic compounds, heavy metals and polycyclic aromatic hydrocarbons. These emissions raise the risk of respiratory, heart and cancer illnesses. Natural waxes like beeswax, rapeseed or soy are safer alternatives.

In mid‑October 2025, storm Alice hammered Spain with torrential rain, causing floods in Catalonia, Valencia and the Balearic Islands . The deluge forced rail lines to close and dozens of flights were cancelled . After the water recedes, quick action is essential: mould can start growing within 24–36 hours, so experts advise removing standing water promptly, airing out rooms and using dehumidifiers.

Air exchange is key: without sufficient ventilation, carbon dioxide (CO₂) levels rise, a sign of poor air quality. A U.S. study in elementary schools found CO₂ concentrations above 1,000 ppm in most classrooms, indicating inadequate ventilation . These rooms had more respiratory viruses detected in air and nasal samples, while classrooms with higher air exchange showed about an 80 percent lower infection risk .