Drying clothes on radiators, while seemingly economical during winter, poses significant risks to indoor air quality. Scientific studies indicate that this practice can increase indoor humidity by 20-30 percentage points, with one load of laundry releasing 1-2 litres of moisture into the air. The World Health Organization (WHO) warns that humidity levels exceeding 60% create conditions conducive to mould growth, which can lead to respiratory problems, particularly in children, the elderly, and individuals with asthma or allergies. Mould species thrive in the damp conditions created by radiator drying, releasing spores that can irritate the respiratory system. Additionally, high humidity levels encourage dust mites, whose waste products are known allergens. Beyond health concerns, drying clothes on radiators can reduce heating efficiency, leading to increased energy consumption as boilers work harder to maintain warmth. There are also safety risks associated with fabric contact with radiators, potentially leading to overheating and fire hazards. Furthermore, synthetic fabrics may emit volatile organic compounds when heated, contributing to indoor air pollution. To mitigate these risks, households should prioritize ventilation and consider alternative drying methods, especially in colder climates.