You have unboxed your new mattress, and there is a faint chemical smell in the room. It is a common experience, especially with mattress-in-a-box, and it raises an obvious question: is this safe to sleep on?
This guide explains what causes that smell, what the evidence says about safety, how long it lasts, and how to clear it quickly.
What Causes the Smell
The smell is called off-gassing. It comes from volatile organic compounds, or VOCs, that are released as fresh foam decompresses and airs out after being tightly compressed in a box.
It is essentially the smell of new materials and trapped air being released, similar to the "new" smell of other freshly manufactured products. It is most noticeable in the first hours and days after unboxing.
Is Off-Gassing Harmful?
For most people, the off-gassing from a quality, certified mattress is a temporary nuisance rather than a health hazard. The smell fades as the compounds disperse with airflow.
That said, some people are more sensitive, and anyone with significant respiratory conditions or chemical sensitivities should take extra care to ventilate the room well and may prefer to let the mattress air out before sleeping on it. Choosing a mattress with foam certifications such as CertiPUR or a cover with OEKO-TEX adds assurance about emissions; our guide to mattress certifications in Australia explains these.
This is general information, not medical advice. If you have asthma or a respiratory condition and are concerned, ventilate thoroughly and speak with your GP.
How Long the Smell Normally Lasts
For most mattresses the smell is strongest in the first day and fades noticeably within a few days, often disappearing within a week with good ventilation.
A warm, well-ventilated room speeds this up, which is convenient in the Australian climate. Cooler, enclosed rooms hold the smell a little longer.
How to Air Out a New Mattress Quickly
A few simple steps clear the smell faster.
- Unbox the mattress in a well-ventilated room as soon as it arrives.
- Open windows and let air circulate, or run a fan across the surface.
- Leave the mattress uncovered for a few hours before putting on bedding.
- If you can, give it a day to breathe before the first night, though sleeping on it sooner is generally fine.
These steps also help the mattress finish expanding to full height. For the bigger picture on boxed mattresses, see how a mattress is made and boxed.
When a Smell Is a Red Flag
Normal off-gassing is mild and temporary. Be cautious if you notice a strong chemical smell that does not fade after a couple of weeks of airing, or a smell that consistently triggers headaches, irritation or breathing problems. In that case, stop using the mattress and contact the retailer.
Frequently Asked Questions
How long does it take for a new mattress smell to go away?
Usually a few days, and often within a week with good ventilation. The smell is strongest on the first day and fades steadily after that.
Is it safe to sleep on a mattress straight after unboxing?
For most people, sleeping on a quality certified mattress the first night is fine, though airing it out for a few hours first is sensible. If you are sensitive to smells or have a respiratory condition, ventilate well and consider waiting a day.
How do you get rid of new mattress smell?
Ventilate the room, open windows, run a fan, and leave the mattress uncovered for a few hours before adding bedding. Warm, airy conditions clear the smell fastest.
Are mattress VOCs dangerous?
For most people the low-level VOCs from a quality certified mattress are a temporary nuisance, not a danger, and they disperse with airflow. Choosing certified foams and ventilating the room well keeps exposure minimal. Those with respiratory conditions should take extra care.
