It’s common to smell mothballs in your house if it’s a bit older. No one really wants their house to smell like mothballs, but the odor can be extremely difficult to remove.

What Causes a Mothball Smell In Your House?

The simple answer is mothballs. Specifically the chemical that causes the mothball smell is naphthalene. Naphthalene also is present in tobacco smoke, and even in the air in highly polluted cities.

Companies that produce products such as ink, dye, coal and tar, preserve wood, or tan leathers also use naphthalene. If you live near one of these sources of naphthalene, your house may take on a strong mothball type smell.