How Long to Air Out New Mattress

The information in this article is for educational purposes only and should not be considered medical advice. [Read our full health disclaimer]

Updated on February 16, 2023

You spend a quarter of your life in bed, or maybe more if you use it for more than just sleeping. With that in mind, it’s necessary to have a comfortable mattress. However, it’s equally essential to your health to air out your new mattress for the right amount of time. That new mattress smell is more than just a nuisance smell; it’s a health concern.

How long should a new mattress air out? Generally, you would need to air out your new mattress for at least 24 hours to several weeks. However, it’s recommended you air out your mattress regularly.

Keep reading because we’ll explain why you want to air out your new mattress, what “off-gassing” is (and why you need to worry about it), how long to air out a new mattress, how to air out your new mattress, and some long term upkeep tips.

Why Air Out Your New Mattress?

There are two reasons to air out a new mattress:

  • To eliminate mattress off-gassing odors left over from manufacturing
  • To fully inflate a vacuum-sealed mattress

What is Mattress Off-Gassing?

New mattress in room

Mattress off-gassing is the continual release of gasses from materials your manufacturer has put into making your new bed. The chemical smell you experience from a new mattress comes from volatile organic compounds (VOCs). The term “volatile” means that the compounds are not stable and break down over time into other forms. In the case of the VOCs in your mattress, they break down into gases in a process called “off-gassing.”

Is VOC Off-Gassing Harmful to Your Health

Mattresses are filled with polyurethane foam, which emits volatile organic compounds (VOCs). These chemicals are often linked to respiratory problems and asthma attacks. Some studies suggest that people who sleep on a mattress containing high amounts of VOCs have a greater risk of developing cancer.

The debate over whether off-gassing is harmful is ongoing. Experts agree that we cannot determine whether or not a person will develop cancer based on how much VOCs are emitted into the air.

However, some companies do take steps to reduce the amount of VOCs emitted during the production process. For example, CertiPUR-USA certifies manufacturers to ensure that the products meet strict standards for VOC emissions.

According to the U.S. Environmental Protection Agency (EPA), VOCs can cause various health issues, including:

  • Respiratory problems such as throat irritation
  • Headaches
  • Coordination problems
  • Nausea
  • Organ damage such as kidney and liver problems
  • Central nervous system damage
  • Cancer-causing carcinogens in animals and humans

Symptoms from exposure to VOC emissions include:

  • Eye irritation
  • Nose and throat irritation
  • Headache
  • Skin allergy symptoms
  • Tiredness
  • Dizziness
  • Difficulty breathing
  • Nausea or vomiting
  • Hemorrhaging blood from the nose

Which Materials and Ingredients Emit VOC Gas?

VOC gases are a type of indoor pollution. Mattresses are not the only products that emit VOC gas. If you ever smelled a new car, new office machines, or new carpet, you will recognize the smell of VOC off-gassing. Many household products, like cleaning products, air fresheners, building materials, and paints, emit VOC gases.

According to the Environmental Working Group (EWG), some of the materials and ingredients that contain VOCs in mattresses include solvent-based glues and foams. Even most plant-based foams (except 100% latex) produce off-gassing fumes. You will find that brands that use more foam or gel in their mattresses will have more odor.

Some chemicals that emit VOC gases include:

  • Added scents
  • Nanoparticles used for waterproofing or as antimicrobials
  • Chemical flame retardants
  • Commercial waterproofers
  • Cotton and hemp pesticides
  • Polyurethane
  • Synthetic latex
  • PVC– made from vinyl chloride (a carcinogen) and may contain phthalates (reproductive toxicants)
  • Vinyl– contains phthalates (reproductive toxicants)
  • Formaldehyde(a carcinogen)
  • Acetaldehyde(a carcinogen)
  • Benzene(a carcinogen)
  • Chlorofluorocarbons
  • Naphthalene
  • Perfluorocarbons
  • Hexane
  • Toluene
  • Ethylbenzene
  • Nonanal
  • Decamethyl Cyclopentasiloxane
  • 2-ethyl hexanoic acid

Which Mattresses Have the Least Amount of VOCs?

Mattresses that contain at least 95% certified-organic materials, such as wool, cotton, and 100% natural latex, have the least amount of off-gassing. When manufacturers make mattresses from natural fibers and use non-toxic adhesives, they still may have an odor. However, the odors won’t be as strong and aren’t a health concern.

While many manufacturers like to keep information about the materials that they use to create their mattresses a secret, you can learn a lot about the mattress by looking at the manufacturer’s claims about the mattress and the types of certifications it has.

There are no laws to regulate how much VOC off-gassing is permissible for a mattress. Luckily, some certifications that come with your mattress can help you to determine if you have a high-off-gassing mattress or not. These certifications will indicate that your mattress will off-gas less:

  • Low-VOC certification like Greenguard Gold
  • Global Organic Textile Standard (GOTS) certification
  • Global Organic Latex Standard
  • Certipur-us certification

Importance of Airing out Mattresses

A new mattress is one of the most important purchases you’ll make in your lifetime. Why? Because it’s the foundation upon which you sleep every night. And while there are many factors that contribute to how comfortable you feel sleeping on a particular bed, one thing you can’t control is whether or not the mattress itself emits unpleasant odors. In fact, some mattresses emit such strong fumes that they’re actually illegal in California. But don’t worry — we’ve got you covered. Here are three reasons why airing out a new mattress is essential.

It eliminates mattress off-gas smells that remain after manufacturing.

white bed linen near white window curtain

When you buy a new mattress, you want to know that it won’t give you any problems down the road. One way to ensure that happens is to air out the mattress properly. If you don’t, you could end up waking up to a room full of musty smells. This is especially true if you bought a memory foam mattress. Memory foams tend to hold onto moisture better than traditional spring coils, so they often retain a lot of body heat overnight. As a result, they release a lot of gas into the air. To combat this problem, you’ll want to open the windows and let the mattress breathe. You might even consider getting a dehumidifier to help speed things along.

It fully inflates vacuum sealed mattresses.

Another reason why airing out a new bed is necessary is that it helps eliminate the smell associated with vacuum sealed mattresses. These mattresses are typically filled with plastic pellets and then sealed inside a bag. When you take the mattress out of the box, however, the plastic pellets begin to break down over time. This process releases gases like carbon dioxide and methane, which can cause a number of health issues. By airing out the mattress, you can prevent this from happening.

It prevents mold growth.

person lying on bed

Mattresses aren’t just about comfort; they’re also about protecting against mold growth. Mold spores are everywhere, including in our homes. They thrive in warm, moist environments, so when you bring a new mattress home, you want to keep it away from sources of humidity. An airing out session allows you to do exactly that.

How Much Should I Worry About Off-Gassing From My New Mattress?

Studies show that most of the VOC gases will release during the first two months that you use your mattress and reach acceptable levels after about six months. VOCs break down over time and release gases slowly. Unfortunately, they tend to release the most VOC gasses when your bed is warm (like while you’re lying in bed).

Maintaining good ventilation with windows and fans and regularly airing your mattress can decrease VOC gas emission risks.

You’re not going to find a list of chemicals that your mattress might emit on the label. However, if the manufacturer makes their mattress from natural materials such as cotton, wool, and natural latex, your mattress will experience far less off-gassing.

Unfortunately, most mattresses don’t come with a return warranty, so if you already have a new mattress that isn’t a low-VOC mattress, you’re probably stuck with it.

How Long Does A New Mattress Need To Air Out

Airing out a new mattress can take as few as 24 hours or as long as several weeks, depending on the brand and whether the manufacturer off-gases before packaging. However, we suggest that you air some baby cot mattresses brands for several months to be on the safe side.

You will know that most of the off-gassing has finished when you can no longer smell a chemical smell from your new mattress. However, it is a myth to believe that all the off-gassing is complete after you can no longer smell the chemicals.

Studies show that some mattresses that have aired out for as long as six months can still release VOC gases. Many foam mattresses, gel mattresses, and memory foam mattresses with man-made materials can off-gas for as long as a year.

table lamp on white wooden nightstand beside bed

Regular Mattresses and Beds in a Box

A mattress from a local retailer will take at least 24 hours to air out enough for you to use for the first time.

If you purchased a vacuum-sealed mattress in a box such as online mattress brands that Amazon carries, it needs up to 48 hours to reintroduce enough air back into to expand to the proper firmness level. Forty-eight hours is also necessary to re-expand memory foam mattress pads.

Leading Brands

Some leading brands require more off-gassing times than others:

  • Casper: Off-gassing odor usually disappears in 24 hours. All Casper mattresses have CertiPUR-US certifications.
  • Leesa: Off-gassing odors usually last a few days. Leesa mattresses have a CertiPUR-US certification.
  • Purple: Off-gassing should complete within 24 hours. However, some consumers report no off-gassing smell at all. Purple mattresses have Certi-PUR-US certifications.
  • Tempur-Pedic: You can expect it to take at least two weeks before the off-gassing odor disappears, but the amount of time varies between models.
  • Tuft & Needle: Off-gassing should only take a few days. Their Original and Mint polyfoam mattresses have CertiPUR-US, STANDARD 100 by OEKO-TEX, and GreenGuard Gold certifications.

Baby and Child Mattresses

There are few regulations in Australia and worldwide concerning the materials manufacturers use in baby and child mattresses. Unfortunately, there are many concerns about the chemicals that manufacturers use in mattresses for baby cots.

Studies show that chemicals linked to cancer such as acetaldehyde, formaldehyde, and benzene still often approach or exceed acceptable risk levels in baby mattresses after six months. These chemicals affect children more because of their size and age.

The following companies make baby cot mattresses without chemicals of concern:

  • Land and Sky
  • Natural Mat
  • Naturepedic
  • Organic Mattress, Inc.
  • Pure Rest
  • Savvy Rest
  • Shepherd’s Dream
  • Sleeptek
  • Soaring Heart Natural Bed Company
  • Suite Sleep
  • Vivetique
  • White Lotus

For peace of mind, if your baby’s mattress is not from one of the above companies, consider airing it out for several months before the baby arrives instead of putting cute sheets on it right away.

Over time, the more often you can air your baby’s or child’s bed, the better. When you’re changing the sheets (which tends to happen often those first few years), consider airing out the mattress rather than immediately replacing the sheets with fresh ones.

A natural-fiber mattress cover can also help provide an extra layer of protection between your baby and the mattress.

How to Air Out a New Mattress

white textile curled

Here are a few tips for airing out a new mattress to eliminate as many off-gassing chemicals as possible:

  • Place a newly unwrapped mattress in a garage or well-ventilated room before sleeping on it. Remember that you want to place the mattress in a place nobody spends time to limit your and your family’s exposure to off-gassing. Do not bring it into your sleeping space until it loses its chemical smell.
  • You can speed up the process if the airing space has a cross breeze, especially if you’re able to open your windows or doors.
  • Use an air purifier in the room that you’re using to air out your new mattress.
  • Air the mattress out in the sun. Put the mattress out in a clean, sunny spot where it can air out naturally. If the mattress came with plastic or cardboard packaging, consider putting it underneath to keep the mattress clean.
  • Sprinkle a layer of baking soda on the mattress to help soak up the smells from your new mattress.

Your nose will tell you when most of the off-gassing has finished. If you’re still smelling chemical smells from your mattress after a few weeks and your mattress came with a warranty, consider returning it for a safer mattress.

How Long To Air Out Mattress and VOC Emission Safety

Research shows that even mattresses that researchers aired out for six months still registered significant levels of VOC emissions. However, the VOC levels were below California’s Office of Environmental Health Hazard Assessment’s strict “No Significant Risk Levels” (NSRL) level.

There aren’t any studies that indicate an expiration date on low-level VOC gas emissions from mattresses. Considering that VOCs are still off-gassing even after the smell dissipates, it’s a good idea to air your mattress out often, especially during the first few months that you own it.

Some long term ideas to help continue to dissipate VOC gases from your mattress include:

  • Air your mattress air out weekly during the time it takes to wash and dry your sheets.
  • Air out your bedroom. Open up your windows from time to time, especially when you’re airing out your mattress.
  • Keep plants in your bedroom. According to NASA research, plants can help remove indoor pollution such as VOC emissions from an indoor space.
  • Keep a natural-fiber mattress pad or dust cover on top of your mattress to put more distance between yourself and any residual VOC gas emissions. A mattress pad can block at least some of the off-gassing toxins from reaching your body. You may still be able to detect the smell in the mattress pad, but at least you can wash it often.


Concluding Thoughts

Airing out your mattress is as critical to your health as choosing the right mattress for your back. If your mattress includes more natural materials and low-VOC certifications, you can expect to be able to use your new mattress in as little as 24-48 hours. However, some mattresses may need days or weeks to off-gas sufficiently. You’ll know your new mattress is ready to put on your bed when it no longer has that new-bed smell.

If your mattress still has a chemical smell after several months, you’re justified in buying a new mattress with a low VOC certification. It might take more time and more money, but your health is worth it. Otherwise, keep airing out your mattress regularly for the best results.

Article Sources

  1. Liang, Y., & Xu, Y. (2014). Emission of phthalates and phthalate alternatives from vinyl flooring and crib mattress covers: the influence of temperature. Environmental science & technology, 48(24):14228-14237.
  2. Hillier, K., Schupp, T., & Carney, I. (2003). An investigation into VOC emissions from polyurethane flexible foam mattresses. Cellular polymers, 22(4):237-259.
  3. Cao, S., Wen, Y., Xi, C., et al.,(2020). Development of a method based on thermal desorption-gas chromatography/mass spectrometry for the determination of 103 volatile organic compounds in mattresses. International Journal of Environmental Analytical Chemistry, 100(9):1044-1065.
  4. Oshima, N., Tahara, M., Sakai, S., & Ikarashi, Y. (2021). Analysis of Volatile Organic Compounds Emitted from Bedding Products. BPB Reports, 4(6):182-192.
  5. Oz, K., Merav, B., Sara, S., & Yael, D. (2019). Volatile organic compound emissions from polyurethane mattresses under variable environmental conditions. Environmental science & technology, 53(15):9171-9180.
Bree Taylor - Lead Editor

Lead Editor

Bree is an interior designer with a passion for helping people improve their sleep quality.

She specializes in creating comfortable and functional bedroom spaces that promote a good night’s rest.

When she’s not testing mattresses or helping people get the best rest possible, Bree loves to travel and explore new cultures.

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