Is the smell of mothballs harmful?
John Johnson
Updated on April 27, 2026
Moth balls contain a toxic chemical, either naphthalene or paradichlorobenzene. Both become a gas when exposed to air and cause that pungent moth ball smell. These gases are irritating to the eyes and lungs and may cause headache, dizziness and nausea. They are both suspected of causing cancer.
What happens if you breathe in mothballs?
Inhalation of naphthalene may cause skin and eye irritation; gastrointestinal symptoms, such as nausea, vomiting, abdominal cramps, and diarrhea; neurologic symptoms, such as confusion, excitement, and convulsions; renal problems, such as acute renal shutdown; and hematologic features, such as icterus and severe anemia ...Are mothballs safe to use in the house?
Per package directions, mothballs should only ever be in tightly closed containers, although even these containers may release vapors. Mothballs are particularly dangerous because they are often used incorrectly. They shouldn't be placed in closets, storage chests, trunks, garment bags, basements, or attics.How long does the smell of moth balls last?
Mothball odor is a terrible smell to have clinging to your clothing. And we have some shocking news for you: a single mothball takes about 3-6 months to dissipate completely. If you put the mothball under fabric or someplace where there is no air circulation, it takes about 12 months to dissipate!What to do when you smell mothballs?
To remove these odors, leave out bowls of vinegar or plates of activated charcoal in the affected areas. (Activated charcoal is sold in various pellet sizes and is usually available at pet stores.) You can also try placing containers of coffee grounds or odor-absorbing candles for similar results.Is smelling naphthalene balls harmful?
Why do I smell mothballs in my house?
Lingering OdorsMothballs are made of naphthalene, a chemical that evaporates quickly and leaves a strong odor behind. If used for long periods or in poorly-ventilated spaces, the odor of dissipated naphthalene can remain long after the mothballs have been removed.