What causes a musty smell?

Answer by  mammakat (11147)

DAMP causes must. Damp causes mold. Mold is dangerous. You need to eradicate whatever is causing the damp, but if it's in your walls (usually drywall) or under your carpets, it can be a major task. This needs to be done, damp effects every part of your body and health.

Answer by  tv5544 (30)

A musty smell is usually caused by lack of air circulation and for some things by storage for a long period of time.