musty smell from carpet

https://epamoldremediationmarket.nexorafield.com/posts/understanding-epa-mold-remediation-guidelines-for-carpet-mold-issues

The musty smell from the carpet hits you as soon as you walk in the room, a damp, earthy odor that clings to the fibers even after vacuuming. It's that old, basement-like scent from moisture trapped underneath, maybe from a spill or humidity over time. You can't quite scrub it out, and it lingers in the air, mixing with the warmth of the space, a reminder that the carpet needs some deep cleaning or even replacing.