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The short version
- New mattress smell comes mostly from VOCs released by foam, adhesives, and fabrics.
- It usually fades within days to a few weeks with good ventilation.
- CertiPUR-US covers foam only; GREENGUARD Gold covers whole-product emissions.
- Ventilate, remove all plastic, and use fans rather than fragrance or heat.
- If the smell persists or causes symptoms, contact the brand while you're still in the trial.
What that new mattress smell actually is
Unbox a new mattress, especially a foam mattress that arrived compressed, and you'll often notice a distinct chemical or "new product" smell. It's commonly called off-gassing: the release of volatile organic compounds (VOCs) from materials such as polyurethane foam, adhesives, and some fabrics and coatings. The smell tends to be strongest right after unboxing, because the materials have been sealed in plastic since manufacturing.
For most mattresses, the smell fades noticeably over days to a few weeks as the materials air out. How long it lasts depends on the materials, the certifications, how long it was sealed, and how well-ventilated your room is.
Why some mattresses smell more than others
| Factor | Effect on smell |
|---|---|
| Polyurethane and memory foam | Common source of the "new foam" smell, especially in all-foam beds |
| Compressed shipping | Materials sealed in plastic release more smell at once when unboxed |
| Adhesives | Glues between layers can contribute to odor |
| Fire barriers and coatings | Some fabrics and treatments add their own odor |
| Natural latex | Can have its own distinct, sometimes rubbery smell |
| Innerspring with thin comfort layers | Often less noticeable odor because there's less foam |
A stronger smell doesn't automatically mean a worse mattress, and a faint smell doesn't guarantee low emissions. Certifications are a better guide than your nose.
Certifications to look for
Certifications don't guarantee a mattress won't smell, but they tell you materials have been tested against specific standards. These are the ones you'll see most often:
CertiPUR-US (foam)
CertiPUR-US is a program for flexible polyurethane foam. Certified foams are tested by independent labs and must be made without ozone depleters, PBDE flame retardants and certain "Tris" flame retardants, mercury, lead and other heavy metals, formaldehyde, and phthalates regulated by the Consumer Product Safety Commission. They must also have low VOC emissions for indoor air quality, under 0.5 parts per million. Note that it certifies the foam, not the whole mattress.
GREENGUARD and GREENGUARD Gold (whole product emissions)
GREENGUARD certification, administered by UL Solutions, tests products for chemical emissions. GREENGUARD Gold has stricter emission limits. Because it can apply to the finished product, it's a useful complement to foam-only certifications.
OEKO-TEX Standard 100 (textiles)
OEKO-TEX Standard 100 tests textiles, such as covers and fabrics, for harmful substances.
GOLS and GOTS (organic materials)
The Global Organic Latex Standard (GOLS) covers organic latex, and the Global Organic Textile Standard (GOTS) covers organic textiles like cotton and wool. They're about organic sourcing and processing, not odor as such, but they're common on mattresses marketed as natural or organic.
A note on fiberglass
Some mattresses use fiberglass in their fire barrier. It isn't an odor issue, but it's worth knowing about: brands generally advise against removing the cover of such mattresses. If that concerns you, look for mattresses that state they're fiberglass-free.
How to air out a new mattress
- Unbox it in a well-ventilated room. Open windows if the weather allows, and run a fan to move air across the mattress.
- Remove all plastic immediately, including any inner wrap, and take the packaging out of the room.
- Let it expand and breathe before making the bed. Follow the brand's expansion guidance. Many recommend waiting a day or more before sleeping on a boxed mattress. Leaving it uncovered during that time also helps the smell dissipate.
- Keep the room ventilated for the first several days. Cross-ventilation (two open windows) moves air faster than one.
- Consider an air purifier. Units with an activated carbon filter are designed to capture some odors and gases. HEPA alone targets particles, not VOCs.
- Stand it on its side if the manufacturer allows it and you have the space, to expose more surface area. Check the brand's instructions first, as some advise keeping it flat.
- Give it time. If the smell is still strong after a couple of weeks of good ventilation, contact the brand. It may still be within your trial window.
What not to do
- Don't spray fragrances or cleaners onto the mattress to mask the smell. That adds chemicals and can affect your warranty.
- Don't use heat, such as space heaters or hair dryers, to speed things up. It's a fire risk and can damage materials.
- Don't leave the mattress in direct sunlight for long periods unless the manufacturer allows it; UV can degrade some foams and fabrics.
Helpful tools while it airs out
Air purifier with activated carbon filter
Tier: $$Carbon filters are designed to capture some odors and gases. Size the unit to your bedroom's square footage.
Box fan or window fan
Tier: $The simplest, cheapest way to speed up off-gassing is moving air through the room.
Breathable mattress protector
Tier: $Once the smell fades, a breathable protector keeps the mattress clean without trapping odor. See our protector guide.
Buying with smell in mind
If you're sensitive to odors, factor it in before you buy:
- Look for foam certified by CertiPUR-US and a whole-product emissions certification like GREENGUARD Gold.
- Consider hybrid or innerspring designs with thinner foam layers, or natural latex (which has its own smell but different materials).
- Ask whether the mattress was made recently or has been in compressed storage for a long time.
- Check the sleep trial, so a mattress that won't stop smelling can be returned. See our trial and return guide.
Frequently asked questions
How long does new mattress smell last?
It usually fades noticeably within days to a few weeks with good ventilation. It depends on the materials, how long the mattress was sealed, and your room's airflow.
Is mattress off-gassing harmful?
Off-gassing releases VOCs. Many people notice only a temporary smell, but some experience irritation or headaches. Ventilate well, choose low-emission certified products if you're sensitive, and talk to a doctor if symptoms persist.
What does CertiPUR-US certification mean?
It means the foam was tested by independent labs and made without certain flame retardants, heavy metals, formaldehyde, and regulated phthalates, with low VOC emissions under 0.5 parts per million. It covers the foam, not the whole mattress.
Can I sleep on a new mattress the first night?
Many brands recommend waiting a day or more for a boxed mattress to expand fully. Follow your brand's instructions, and ventilate the room either way.
Does an air purifier help with mattress smell?
Purifiers with an activated carbon filter are designed to capture some odors and gases. HEPA-only filters target particles, not VOCs. Ventilation is still the most effective step.
What if the smell doesn't go away?
If it's still strong after a couple of weeks of good ventilation, contact the brand. You may still be within the trial window.
Sources: CertiPUR-US · UL GREENGUARD Certification · EPA: Volatile Organic Compounds' impact on indoor air quality