Mothballs Around Humans and Animals: Safety Basics

If you have ever wondered are mothballs safe for humans, the short answer is no, not to breathe around your living space. Mothballs release fumes meant to drive pests away, and those same vapors can irritate people and animals. If you are trying to protect clothes or storage areas, you can do it without risking toxic exposure.

For more help, see our Naphthalene and Mothballs: Ingredients, Vapor Action, Risks guide.

What Mothballs Are and Why People Use Them

Mothballs are solid pesticide products made to release protective vapors over time. People use them in closets, trunks, and storage spaces to reduce moth damage and other pests. The approach relies on odor and airborne chemicals, not physical barriers, so safety depends on how confined the fumes are.

How mothballs release vapors to repel pests

Mothballs work by slowly releasing pesticide vapors into nearby air. The fumes concentrate in the same enclosed space where clothes or items are stored. As long as the product is sealed in an appropriate container, the vapors stay closer to the target area and the odor helps discourage pests.

If you place mothballs in open rooms, near vents, or where air can move freely, the vapors spread. That is when you start noticing stronger smells in hallways or living areas, and when irritation risks rise for anyone breathing the air.

Use mothballs only inside sealed storage that limits air movement.
Keep mothballs away from air returns, fans, and open doorways.

Stop using the product if the odor is drifting into occupied areas.

Common indoor uses and why they can backfire

People often store mothballs in closets, attics, garages, and crawl spaces, expecting the odor to stay put. The problem is that real homes have cracks, duct leaks, and pressure changes from heating and air conditioning. Even a “rarely used” room can feed fumes into the rest of the house over time.

Another backfire is using mothballs loosely, like setting them on shelves or floors inside storage. Loose placement increases the surface area and makes the vapors spread faster.

Never place mothballs loose on shelves or floors.
Avoid using them in areas connected to living spaces by shared airflow.
Replace the product when odor control is no longer consistent, because fading odor does not mean the risk disappears.

Why the label is not the same as safe for open-air use

Labels list approved use areas, and they usually assume confinement and specific storage conditions. A product might be permitted for enclosed storage, but that does not mean it is safe in open-air spaces like yards, garages with doors open, or crawl spaces without sealing.

If you use mothballs where people or pets can enter and breathe air directly, you are moving the pesticide into an exposure pathway. Odor can also lure pets and increase the chance of accidental chewing or swallowing.

Follow the label for container type, placement, and room restrictions exactly.
Do not treat “out of sight” as “out of reach,” especially for pets.

Do not use mothballs for odor control in spaces where the public moves in and out.

How Mothballs Affect Human Health

Mothballs can cause irritation because the vapors are pesticide chemicals designed to affect living organisms. When you breathe them, you risk eye, nose, and lung irritation. In enclosed or poorly ventilated spaces, exposure can build up and symptoms can show up quickly.

Short-term symptoms from breathing the fumes

Short-term exposure commonly causes irritation of the eyes, nose, throat, and airways. People may feel burning or watering eyes, a scratchy throat, coughing, wheezing, or shortness of breath. Some people also develop nausea or headaches, especially if they were in the area for more than a brief moment.

The key warning sign is symptoms that start during exposure and improve when you leave the area. If symptoms persist, the exposure level may have been too high.

Notice irritation in the eyes, nose, or throat during time near the mothballs.
Watch for coughing, wheezing, or trouble breathing.
Leave the area for fresh air if symptoms appear.

Why children, pregnant people, and people with asthma are at higher risk

Children breathe faster and are closer to floor-level storage where fumes can collect, so their exposure can be higher for the same space. Pregnant people and developing fetuses can be more vulnerable to chemical stressors, and irritation can worsen stress responses. People with asthma have inflamed, sensitive airways, and vapors can trigger flare-ups.

These groups should avoid mothball use altogether, and anyone living with them should treat mothballs as unsafe inside the home.

Keep mothballs out of homes with children or anyone who is pregnant.
Avoid mothballs entirely if anyone has asthma or reactive airway symptoms.

Choose storage methods that do not require pesticide vapors.

Signs that exposure may be too high for a home

Exposure is too high when people notice consistent odor in living areas, recurring symptoms, or worsening irritation over days. If the smell returns soon after you “air out” the space, that means vapors are still migrating.

Also treat strong, persistent coughing, wheezing, chest tightness, or breathing difficulty as a high-risk situation. In those cases, do not keep mothballs in place while “waiting to see.”

If mothball odor reaches kitchens, bedrooms, or hallways, stop use.

If symptoms persist after leaving the area, seek medical advice promptly.
If multiple household members react, remove the exposure source immediately.

Are Mothballs Safe for Pets and Other Animals?

Mothballs are not safe for pets. Animals can inhale fumes, get irritated skin or eyes, and in some cases ingest the product. Many veterinary emergencies involve accidental access, including chewing or swallowing.

Why dogs, cats, and wildlife may be harmed by the fumes

Dogs and cats investigate smells, and the odor that repels pests can attract curious animals. Once close to mothballs, pets inhale higher concentrations of vapors and may develop eye and airway irritation. Smaller animals like rodents and rabbits can be affected even faster because their bodies are smaller and their breathing rates can be higher.

Wildlife can be exposed when mothballs are used outdoors or when products drift into garages, sheds, or crawl spaces near food sources.

Keep mothballs fully sealed and locked away, never accessible by nose-level curiosity.

Avoid outdoor use that can expose wildlife or neighborhood animals.
Assume any odor near pet areas means higher inhalation risk.

What makes mothballs especially dangerous if swallowed

Swallowing is a medical emergency. Mothballs contain pesticide chemicals, and ingestion can cause rapid illness. A pet may vomit, drool, look weak, show trouble breathing, or develop neurological signs depending on the product.

Even a small amount can be dangerous, and the risk increases if you do not get immediate veterinary guidance. Do not wait for symptoms, especially if you suspect ingestion.

Treat any suspected ingestion as urgent.
Do not induce vomiting unless a professional tells you to.
Have the product label ready for the vet or poison service.

How to spot a possible pet exposure emergency

Act quickly if you see sudden distress, breathing changes, unusual weakness, repeated vomiting, or drooling after your pet was near mothballs. Eye redness, pawing at the face, or coughing after exposure also counts as a warning sign.

For cats, ingestion can be hard to notice at first. If you find broken mothballs, stained containers, or the odor in an area your pet can access, contact a professional even if your pet looks “okay.”

Watch for coughing, wheezing, or trouble breathing.
Look for repeated vomiting or drooling.
Treat broken, missing, or chewed mothballs as a sign of possible ingestion.

Safer Ways to Protect Clothes and Storage Spaces

You can protect garments and reduce pest damage without using toxic vapors. The safest approach uses physical barriers first, then optional low-risk deterrents that do not introduce pesticide fumes into a home.

Use airtight containers and clean storage first

Start by removing the food sources pests use. Wash or dry-clean clothing before storage, and ensure items are fully dry to prevent mildew and pest attraction. Next, place items in airtight containers or sealed garment bags so moths and larvae cannot enter.

This method does not rely on chemical vapor exposure for pest control. It also reduces odor transfer and keeps storage spaces safer for children and pets.

Wash and fully dry clothes before packing them away.
Store items in airtight bins or sealed garment bags, not open shelves.
Keep containers sealed until you are ready to use the items.

Try cedar, lavender, or other lower-risk deterrents

Non-pesticide deterrents like cedar and certain scent-based options can help repel some pests. Cedar chests and properly sized cedar blocks provide a stronger barrier effect when used in sealed storage. Lavender sachets can add odor protection, though they are not a substitute for airtight containment.

Use these options in a way that prevents contact with pets. Keep sachets in closed containers or in pouches that your animals cannot open.

Use cedar inserts or cedar-lined storage with closed containers.
Place lavender sachets inside sealed or closed storage, away from pet access.
Replace scent-based deterrents when odor fades.

When professional pest control is the better option

If moths have already taken hold or you are dealing with more than one pest source, professional pest control can be safer and more effective. Pros can identify where the pests are coming from, treat the source, and avoid spreading pesticide vapors through occupied living areas.

Choose this route especially when you have children, pets, or anyone with asthma in the home. A tailored plan reduces the need for risky DIY products.

Call a licensed pest control company if moths keep returning.
Ask for treatment options that target the source, not just odor masking.

Keep pets and people out of treated areas as directed.

What to Do If Someone or a Pet Was Exposed

If exposure happens, act fast. The right first steps protect the airway and reduce ongoing inhalation. Then contact the appropriate poison resource based on whether the exposed person is human or an animal.

Move to fresh air and stop the exposure source

Leave the exposure area immediately. Move to fresh air, open outside doors and windows if you can do so safely, and keep others away from the fumes. If you can safely remove mothballs from the space without handling them directly for long, do it. Otherwise, isolate the area and wait for help.

For pets, remove your animal from the space right away. Do not let your pet lick or chew any remaining product.

Get everyone to fresh air, start moving away from the fumes.
Stop the source by removing or sealing the mothballs if safe to do so.

Keep children and pets out of the area until it is cleared.

Call poison control or a vet based on symptoms

For humans, call Poison Control for immediate guidance. If symptoms are severe, call emergency services. For pets, contact your veterinarian or an emergency animal poison service right away, even if symptoms are mild.

Do not wait for symptoms when ingestion is suspected. The label and ingredient name help the poison team advise you faster, and they may recommend specific next steps based on amount and timing.

Call Poison Control for human symptoms, or your pet’s vet for animal exposure.
Share the product name, strength, and how much was involved.
Follow the professional’s instructions for home care or transport.

Save the product label and note how much was involved

Gather the exact product label and any packaging. Write down the time of exposure, where it happened, and how long the person or pet was near it. If ingestion is suspected, note what was missing, the approximate number of mothballs, and any visible chewing.

These details help professionals estimate risk and decide whether observation, treatment, or emergency care is needed.

Save the label and photograph it if you can.
Note the room, storage area, and ventilation conditions.
Estimate quantity involved, even if it is approximate.

How to Read the Label and Store Mothballs Correctly

The label is the safety plan. Storage and use instructions define the conditions where the product is considered appropriate, and they also limit exposure routes into occupied spaces.

Follow the exact approved-use directions

Check the label for approved placement, container requirements, and room restrictions. Use the stated amount only, and do not spread the product around to “cover more space.” If the label says to place mothballs in a sealed container with specified airflow limitations, follow that.

If you cannot follow the label conditions because of pets, children, or shared air, do not use the product.

Use the exact amount listed on the label.
Place mothballs only where the label allows, using the recommended container type.
Do not place mothballs in open closets, drawers, or living spaces unless the label explicitly permits it.

Keep mothballs away from food, toys, and animal spaces

Mothball fumes should never be near food storage, kitchen cabinets, or dishes. Keep them away from toys and baby items, even if the product is “in storage.” Pets should have zero access, including to bins and bags that smell like mothballs.

Plan storage like a hazard: locked, labeled if possible, and physically separated from areas used for eating or play.

Never store mothballs in kitchens, pantries, or near food.
Keep them away from toys, bedding, and areas pets use.

Use a locked, sealed container that prevents contact and odor migration.

Dispose of old or loose mothballs the right way

Old or damaged mothballs can be broken into smaller pieces, increasing exposure and making accidental contact more likely. Do not toss loose mothballs where pets or children can find them. Follow local disposal rules and the product label instructions for end-of-life handling.

If the product is leaking odor or appears degraded, handle it carefully and keep it sealed until disposal.

Seal remaining mothballs in their original container or a tight bag before disposal.
Follow the label and local guidance for hazardous pesticide disposal.
Do not dump mothballs into household trash if the label directs a different method.

When Mothballs Should Not Be Used at All

Some situations create exposure risk that you cannot control well with careful placement. In those settings, skip mothballs entirely and use safer storage methods or professional help.

Open rooms, garages, yards, and crawl spaces

Mothball vapors disperse in open air and can migrate through vents, doorways, and pressure changes. Garages, crawl spaces, and yards are difficult to isolate from the rest of the home, so fumes can reach people and pets unexpectedly.

Outdoor use also raises wildlife exposure risk and increases uncontrolled contact.

Do not use mothballs in open rooms or areas with frequent foot traffic.
Avoid garages and crawl spaces that connect to living airflow.
Skip yard use where animals can access treated items.

Homes with children, pets, or poor ventilation

If children or pets are present, mothballs add a preventable poisoning and inhalation risk. Poor ventilation makes fumes build up and spread, raising irritation and respiratory problems.

In these homes, use airtight storage, cleaning, and non-vapor deterrents instead of pesticide vapors.

Avoid mothballs in any home with pets or young children.
Do not use them in poorly ventilated spaces.
Choose sealed bins and garment bags as your primary defense.

Situations where odor control is being mistaken for pest control

Smell is not proof that pests are gone. Odor control can hide an active infestation rather than remove the source, and it can also create unnecessary exposure just to keep the smell present.

If you can see webbing, larvae, damaged fabric, or recurring moths, switch to source removal, cleaning, and targeted pest control.

If moths keep returning, stop relying on odor and find the source.

Clean and inspect storage areas before using any deterrent.
Use pest control solutions designed for infestation, not fragrance masking.

Frequently Asked Questions

Are mothballs safe for humans to breathe around?

Not really. Mothballs give off concentrated fumes that can irritate the eyes, nose, and lungs, and repeated exposure can be harmful, especially in enclosed spaces. If you notice eye watering, coughing, wheezing, or throat irritation when you are near mothballs, stop the exposure and get fresh air. In homes with shared ventilation, even careful closet use can lead to odor migration into living areas.

Are mothballs toxic to animals?

Yes. They can be toxic to many animals if inhaled, touched repeatedly, or especially if swallowed. Cats and dogs are both at risk, and smaller animals may be affected even faster. The risk increases when pets can access the storage area or when mothballs are placed where they can be chewed or knocked over.

Are mothballs safe for dogs?

No, mothballs are not a safe dog deterrent or odor solution. Dogs can be exposed by breathing the vapors or eating them, and ingestion can be a medical emergency. Even if your dog does not eat mothballs, close exposure to fumes can still cause irritation, coughing, and breathing problems.

What should I do if my pet ate a mothball?

Treat it as urgent. Contact a veterinarian or emergency animal poison service right away and do not wait for symptoms to appear. Time matters with ingestion, and the professionals will guide you based on the product and approximate amount. Keep the product label available when you call.

Can I use mothballs in a closet or attic if people do not spend much time there?

Only if the product label specifically allows that use and the area is used exactly as directed. Even then, the fumes can migrate into living spaces, so caution is essential. If the odor ever reaches occupied areas, or if children or pets can access the space, mothballs should not be used.