Why Your Carpet Smells Musty Before You See Mold

https://homerecoveryjournal.slatecurrent.com/posts/why-your-carpet-smells-musty-before-you-see-mold

When humidity lingers, mold spores start to grow in your carpet's backing before showing any signs on the surface. The musty smell comes from tiny patches of mold in the under-layer, which is usually damp due to spills, high humidity, or poor ventilation. The scent often serves as a first warning—the mold is already spreading out of sight, especially in low-light areas, and cleaning it promptly can prevent it from becoming a bigger problem.