New Mattress Smells Like Chemicals? What You Need to Know

Quick Answer

The chemical smell from a new mattress is caused by volatile organic compounds (VOCs) released from foams, adhesives, and flame retardants — a process called off-gassing. For most people, it's unpleasant but not harmful. The smell typically fades within 3 to 7 days. You can speed this up by unwrapping the mattress in a well-ventilated room and waiting 24 to 48 hours before sleeping on it.

What You're Actually Smelling

When you unbox a new mattress — especially a memory foam or hybrid mattress that arrives compressed in a box — the smell can be startling. It's often described as chemical, plasticky, or similar to fresh paint.

That smell is off-gassing: the release of volatile organic compounds (VOCs) that were trapped in the mattress materials during manufacturing. These compounds are gases at room temperature, so once the mattress is unwrapped and exposed to air, they begin evaporating.

The primary sources of VOCs in mattresses include:

Polyurethane foam, the base material in most modern mattresses. The chemical reactions used to create the foam leave behind trace compounds that slowly release over time.
Memory foam (viscoelastic foam), which involves additional chemicals in its manufacturing process and tends to off-gas more than standard foam.
Adhesives used to bond different foam layers together.
Flame retardants, which are required by law in many countries. These are applied to or incorporated into the foam.
Plastics and vinyl in the mattress cover or the compression packaging.

Is It Harmful?

This is the question everyone wants answered, and the honest answer is: for the vast majority of people, the off-gassing from a new mattress is not a health concern. But the picture deserves more nuance than a simple yes or no.

The VOCs released from mattresses include compounds like formaldehyde, benzene, toluene, and various other organic chemicals. In high concentrations, these can absolutely be harmful. But the concentrations released from a mattress are very low — far below the levels that would cause acute health effects.

A 2019 study published in Environmental Science & Technology measured VOC emissions from several types of polyurethane foam mattresses. The researchers found that while the mattresses did emit measurable VOCs, the levels were generally well below established safety guidelines, even in a poorly ventilated room.

That said, there are some groups who should be more cautious:

People with chemical sensitivities or asthma. If you're someone who reacts to strong perfumes, new car smell, or fresh paint, you may experience headaches, nausea, or respiratory irritation from mattress off-gassing. These reactions are to the smell and irritant properties of the chemicals, not typically to toxic exposure.

Infants and young children. Babies spend more time on mattresses (14 to 17 hours a day for newborns), have faster breathing rates relative to their body size, and have developing organ systems. For crib mattresses, choosing a certified low-emission product is a reasonable precaution.

People with respiratory conditions. Existing conditions like asthma or COPD can be aggravated by VOC exposure, even at low levels.

How to Get Rid of the Smell Faster

Tip

Unwrap your new mattress in a spare room or well-ventilated area — not your bedroom. Open windows, turn on fans, and let it air out for 24 to 48 hours before moving it to where you'll sleep. This single step eliminates most of the off-gassing smell before you ever have to breathe it in at night. If you don't have a spare room, open your bedroom windows wide and run a fan pointed at the mattress.

Beyond the initial airing out:

Temperature helps. VOCs evaporate faster in warmer conditions. If you can safely raise the room temperature (by turning up the heating or placing the mattress in a sun-warmed room), the off-gassing process will complete more quickly.
Airflow is essential. A breeze across the mattress surface carries away VOCs as they're released. An open window with a fan creating cross-ventilation is ideal.
Baking soda can help. Sprinkle a thin layer of baking soda over the mattress surface, leave it for several hours, then vacuum it off. Baking soda absorbs some odour compounds. It won't eliminate off-gassing, but it can reduce the perceived smell.
Be patient. Most of the off-gassing happens in the first 48 hours. The smell should be barely noticeable after a week. If a strong chemical smell persists beyond two weeks, something may be wrong with the mattress — contact the manufacturer.

Certifications That Actually Mean Something

If you are also wondering why you wake up tired even after 8 hours of sleep, it is worth considering whether your mattress or sleep environment is part of the problem.

If off-gassing concerns you, look for mattresses with these certifications:

CertiPUR-US (primarily North American). This certifies that the foam is made without certain harmful chemicals, has low VOC emissions, and meets content and durability standards.

OEKO-TEX Standard 100. This tests the finished product for a wide range of harmful substances. It's stricter than CertiPUR-US and covers the entire mattress, not just the foam.

GREENGUARD Gold. This specifically certifies low chemical emissions. Products that meet this standard have been tested for over 10,000 chemicals and are approved for use in sensitive environments like schools and healthcare facilities.

These certifications don't mean zero VOCs — they mean VOC levels have been tested and fall below established thresholds.

The "Natural" and "Organic" Question

Mattresses marketed as natural or organic (typically latex, wool, and cotton) do tend to off-gas less than synthetic foam mattresses. Natural latex has a mild rubbery smell that some people notice, but it's generally less intense and less chemical-smelling than polyurethane foam.

However, "natural" is not a regulated term in the mattress industry. A mattress can be called natural while still containing synthetic materials and adhesives that off-gas. If this matters to you, look for specific certifications (like GOLS for organic latex or GOTS for organic textiles) rather than relying on marketing language.

Organic and natural mattresses cost significantly more. Whether the reduced off-gassing justifies the price difference depends on your sensitivity and priorities. For most healthy adults, a CertiPUR-US certified foam mattress that's been properly aired out is perfectly fine.

A Practical Bottom Line

Off-gassing from a new mattress is a real phenomenon, not imagined. The smell is genuinely unpleasant. But for the average healthy adult, it's more of a nuisance than a health hazard. Air out the mattress before sleeping on it, choose certified products when possible, and don't lose sleep over losing sleep — the smell will fade.