👉 Footwear fumes, also known as odorant emissions from shoes, are caused by the natural breakdown of sweat and oils on the skin, combined with various chemicals and materials used in shoe manufacturing. These fumes can include a range of odors such as ammonia, acetone, and musk, which are often described as musty, sweet, or even chemical-like. The intensity of these smells can vary depending on factors like humidity, ventilation, and the type of footwear; for instance, leather shoes tend to emit stronger odors due to the natural breakdown of tannins. While many people find these fumes unpleasant, they are generally not harmful in small concentrations but can be bothersome and indicative of poor shoe care or hygiene. Regular cleaning and proper ventilation can help mitigate these odors.