Memory Foam Pillow Chemical Smell: Off-Gassing Explained
Short answer: a new memory foam pillow chemical smell comes from off-gassing, the release of volatile organic compounds (VOCs) from the foam. It is strongest when you first open the pillow, partly because it was sealed in plastic. In a peer-reviewed study of two new memory foam mattresses (Beckett and colleagues, Chemosphere, 2022), airborne VOC levels peaked on the first day and then declined over the following month, and the researchers found them well below health-based benchmarks. That study tested mattresses, not pillows, but the pattern is the useful part: air the pillow out, and if the smell or any irritation doesn't settle, set it aside and contact the seller.
Below: what the smell actually is, what the evidence says about how it fades, what a CertiPUR-US label does and doesn't promise, and where airing out stops being the answer.
If the smell is making you feel unwell
Start here if the pillow is doing more than smelling odd. The U.S. Environmental Protection Agency's page on VOCs and indoor air quality (last updated June 23, 2026, read September 24, 2026) lists eye, nose and throat irritation and headaches among the health effects of VOCs. It also says "the extent and nature of the health effect will depend on many factors including level of exposure and length of time exposed," and that the ability of these chemicals to cause health effects "varies greatly from those that are highly toxic, to those with no known health effect."
In practical terms, if a new pillow seems to be bothering your eyes, nose, throat or head:
- Take the pillow out of the bedroom and ventilate the room. The EPA's first listed step for reducing VOC exposure is to "increase ventilation when using products that emit VOCs."
- Contact the seller about a return or exchange. Return windows are time-limited, so it's worth doing early.
- If symptoms don't settle once the pillow is out of the room, or you have asthma or another breathing condition, talk to a doctor. We can explain what off-gassing is. We can't tell you how your body is reacting to it.
What the memory foam pillow chemical smell actually is
The EPA defines VOCs simply: they "are emitted as gases from certain solids or liquids." Its list of everyday sources includes household products like paints, cleaners and air fresheners, as well as building materials and furnishings. It also notes that concentrations of many VOCs are "consistently higher indoors (up to ten times higher) than outdoors."
Memory foam is a type of polyurethane foam, and new foam releases some of the volatile compounds left from its manufacture. That release is what you smell. Three things make a pillow's first day especially noticeable:
- Packaging. Many foam pillows ship compressed and sealed in plastic, so whatever the foam releases in transit has nowhere to go until you open it.
- Distance. A pillow sits right under your nose for hours. Even a faint smell is hard to ignore at that range.
- The cover. The fabric cover, its finishes and the packaging itself can carry their own smells, separate from the foam.
How long off-gassing lasts: what the evidence shows
We looked for independent research measuring VOC emissions from memory foam pillows specifically and didn't find any. The closest peer-reviewed work is on memory foam mattresses, which are made of the same broad material.
The most useful study is Beckett and colleagues, published in Chemosphere in 2022. They measured the air around two new memory foam mattresses in a simulated room over 32 days. Airborne concentrations of the chemicals linked to the mattresses "peaked during the first day after installation and progressively decayed over the course of the following 31 days."
The decline happened in two phases. Short-term emission half-lives were on the order of hours (roughly 4 or 12 hours, depending on the chemical), and long-term half-lives were on the order of days (roughly 24 days). The authors concluded that the levels they measured and modeled were "well below available health-based benchmarks," and that it is unlikely the mattress models they evaluated "would pose a health risk to consumers."
What that means for a pillow, with the limits spelled out:
| What the study found | What it suggests for a pillow | The limit |
|---|---|---|
| Levels peaked on day one | The first day or two after unboxing is when airing matters most | Tested mattresses, not pillows |
| A fast phase measured in hours | The sharp "new foam" smell should ease fairly quickly | Only two mattress models were tested |
| A slow phase measured in weeks | Low-level release can continue after the smell is hard to notice | A fading smell isn't the same as zero emissions |
| Levels well below health benchmarks | Reassuring for the products tested | It doesn't vouch for any other product |
Pillow makers commonly say the smell of a new foam pillow fades within a few days of airing. That's their own estimate, and we didn't find an independent measurement to confirm or contradict it for pillows.
How to air out a new memory foam pillow
None of this needs special products. It's mostly time and fresh air, which lines up with the EPA's general guidance to increase ventilation and use products according to the manufacturer's directions.
- Remove every layer of packaging as soon as it arrives, including any inner plastic sleeve.
- Take the cover off and wash it according to its care label before first use. That takes the cover's own smell out of the equation.
- Let the foam stand in a ventilated room, ideally not the one you sleep in, with a window open or a fan moving air. Standing the pillow on its edge exposes more surface.
- Give it a few days before judging it. The mattress study found the steepest drop early, so day one is not the moment to decide.
- Keep solid foam out of the washing machine. Solid memory foam generally shouldn't be machine-washed; our pillow care guide explains which fills can go in the machine and which can't.
Shredded memory foam pillows are different. Some carry a care label that allows machine washing, and if yours does, the steps are in how to wash pillows in a washing machine. The catch is drying: foam pieces hold water, and a pillow that goes back on the bed damp swaps a chemical smell for a musty one. How to dry pillows without ruining the fill covers how to get the center fully dry.
Baking soda and sunlight come up constantly in advice about foam smells. We didn't find testing showing either one changes VOC emissions from foam, so we treat them as optional rather than recommended, and we'd check the care label before putting foam in direct sun.
What a CertiPUR-US label does and doesn't tell you
Many memory foam pillows carry a CertiPUR-US label, and it's often read as "no chemical smell" or "chemical-free." It isn't either.
According to the CertiPUR-US frequently asked questions (read September 24, 2026), the program is run by a nonprofit, the Alliance for Flexible Polyurethane Foam, and the label means "the foam in the bedding or upholstered furniture has been tested to meet CertiPUR-US® rigorous standards for emissions, content and durability." Certified foam must be:
- made without formaldehyde, ozone depleters, and phthalates regulated by the U.S. Consumer Product Safety Commission
- made without mercury, lead and other heavy metals
- low in VOC emissions for indoor air quality, which the program states as "less than 0.5 parts per million"
- screened for relevant chemicals, including flame retardants, classified as carcinogens, mutagens or reproductive toxins
| A CertiPUR-US label covers | It doesn't cover |
|---|---|
| The flexible polyurethane foam inside | The cover, zipper, thread or any other component |
| A limit on VOC emissions from that foam | A promise of no smell at all |
| The content requirements listed above | Any other material in the product; the FAQ states "We only certify flexible polyurethane foam" |
The same FAQ makes a fair point about expectations: "There are few things on this planet that do not 'off-gas' to some extent, including your own body!" A certified foam pillow can still smell when it's new. The label tells you the foam met a set of limits, not that you won't notice anything.
Chemical smell or something else?
Not every bad smell from a foam pillow is off-gassing, and the fix depends on which one you have.
| What you notice | Most likely cause | Where to go next |
|---|---|---|
| Sharp, plastic or paint-like smell on a brand-new pillow, fading day by day | Off-gassing from new foam | Keep airing it out, as above |
| The same smell, not fading at all after several days | The foam or the cover | Contact the seller before the return window closes |
| Musty or damp smell, often after washing | Moisture trapped in the fill | Dry it completely before using it again |
| Sour or sweaty smell on a pillow you've used for months | Body oils and sweat built up in the pillow | The odor section of our pillow care guide |
A musty smell that keeps coming back, especially with visible spots, is a different problem from off-gassing and shouldn't be aired out and ignored.
When to stop airing it out and send it back
Airing out works when the smell is clearly getting weaker. It isn't a reason to keep a pillow that isn't improving. A practical rule:
- Keep airing if the smell is noticeably fainter each day and nothing is bothering your eyes, nose, throat or head.
- Contact the seller if the smell isn't clearly fading after several days, or if it seems to come from the cover rather than the foam. Check the return policy on day one, because return windows are time-limited and conditions vary by seller.
- Take it out of the bedroom if you notice irritation or headaches, as covered at the top of this article, and talk to a doctor if symptoms continue.
What airing out can't tell you
Your nose isn't a measuring instrument. A fading smell tells you the strongest compounds are dropping, not which chemicals the foam released or at what level. The mattress study's slow phase is a reminder that emissions can continue at low levels after the smell becomes hard to notice. A pillow that has stopped smelling is a good sign, not a certificate. If you have a condition that makes you sensitive to airborne irritants, that's a conversation for your doctor, not something airing out can settle.
FAQ
Is the chemical smell from a new memory foam pillow harmful?
The EPA lists eye, nose and throat irritation and headaches among VOC health effects and says the effect depends on the level and length of exposure. A 2022 Chemosphere study of two new memory foam mattresses found VOC levels well below health-based benchmarks. No study we found tested pillows. If you feel unwell, take the pillow out of the room and talk to a doctor if symptoms persist.
How long does memory foam pillow off-gassing last?
In the 2022 mattress study, levels peaked on the first day and declined over the following month, with a fast drop measured in hours and a slow tail measured in weeks. Pillow makers commonly say the smell fades within a few days; that's their estimate, not an independent measurement.
Can you wash a memory foam pillow to get rid of the smell?
Solid memory foam generally shouldn't go in a washing machine. Some shredded foam pillows are labeled machine-washable, and the cover usually is. Follow the care label, and dry any washed foam completely.
Does CertiPUR-US certified foam have no smell?
No. CertiPUR-US sets limits on content and on VOC emissions from the foam, and its own FAQ notes that almost everything off-gasses to some extent. The certification covers the foam only, not the cover or other parts.
A chemical smell from a new memory foam pillow is common, strongest at the start, and in the one relevant study we could find, it faded on a predictable curve. Give it air and a few days. If it isn't improving, or it's bothering you, the seller and, where symptoms are involved, a doctor are the right next calls.
