If you’re looking into buying a new mattress, you’ve probably come across the term ‘new mattress smell’ and wondered what actually causes it.
As a sleep writer and mattress reviewer who’s unboxed more beds-in-a-box than I can count, I’ve experienced that unmistakable just-opened scent plenty of times. Sometimes it’s faint. Sometimes it fills the room. Either way, it raises the same question: is this normal — and is it safe?
To give you a balanced view, I’ve dug into the research behind mattress off-gassing, looked at what UK retailers and brands say, and explored what independent experts advise about VOCs, safety, and how to get rid of the smell faster.
Let’s break it down.
What is ‘new mattress smell’?
‘New mattress smell’ is the odour that’s released when you unpack a new mattress — especially a boxed mattress that contains foam layers.
It’s most commonly linked to off-gassing, a process where materials release small amounts of chemicals called volatile organic compounds (VOCs) into the air.
This is particularly common in:
- Memory foam mattresses
- Polyurethane foam mattresses
- Hybrid mattresses with thick foam comfort layers
- Mattresses that use adhesives or synthetic covers
When compressed and sealed in plastic for delivery, these materials trap odours. Once opened, they expand — and release them.
What does a new mattress smell like?
Most people describe it as:
- Slightly chemical
- Like fresh paint or varnish
- Plastic-like
- Or simply “factory fresh”
In my experience testing mattresses, the smell is usually strongest in the first few hours after unboxing. In a well-ventilated room, it’s rarely overpowering — but in a small bedroom with the windows shut, it can linger.
The intensity depends on:
- The type of foam used
- The density of the mattress
- How long it was sealed
- The airflow in your room
Is new mattress smell harmful?
This is where things get a little more nuanced.
The reassuring bit
Mattresses sold in the UK must comply with strict safety regulations. Reputable brands use foams that are tested and certified for low VOC emissions. Certifications you might see include:
For most people, off-gassing is not harmful. The levels of VOCs released are generally considered low and fall within safety standards.
The CertiPUR label means that the foams used are free from harmful chemicals, CFCs, or added phthalates, which is means that there is lower emissions for better indoor air quality.
Also having CeritPUR foam inside mattresses means that there is safe, non-toxic levels of fire retardants.
For example, the Simba Hybrid and Nectar Memory Foam mattress use CertiPUR® foam during the manufacturing process.
Another alternative is to purchase a mattress that uses natural materials inside, such as wool, cotton, and mohair for example. The Flaxby Natural Mattress collection from Dreams is a great option to consider.
The cautious perspective
However, some people may be more sensitive, including:
- Asthma sufferers
- Those with respiratory conditions
- Pregnant women
- Babies and young children
- People sensitive to strong smells
In these cases, temporary symptoms like mild headaches, dizziness, or throat irritation are possible — usually short-lived and improving with ventilation.
If you’re particularly sensitive, opting for a mattress made with natural materials (like wool, cotton, or latex) may reduce the likelihood of noticeable odour.
How long does new mattress smell last?
In most cases:
- Strong smells fade within 24–72 hours
- Noticeable odour typically reduces significantly within a few days
- Very mild scent can linger for up to a week
The bulk of off-gassing happens immediately after unpacking. That’s why the first day is key.
From testing dozens of mattresses, I’ve found that:
- Memory foam beds tend to smell more initially
- Natural fibre or pocket spring mattresses usually have very little noticeable odour
- Warmer rooms can intensify the smell temporarily
How to get rid of new mattress smell faster?
If you want to speed things up, airflow is your best friend.
1. Ventilate the room
Before you even open the box, open windows and doors. Cross-ventilation works best.
2. Let the mattress breathe
Remove all plastic packaging immediately and keep bedding off for at least several hours.
3. Use a fan
Positioning a fan to circulate air across the mattress can help disperse VOCs more quickly.
4. Consider an air purifier
Some air purifiers with activated carbon filters can help reduce airborne VOCs.
5. Give it time
Most mattresses are safe to sleep on the same night, but if the smell bothers you, waiting 24 hours can make a noticeable difference.
Avoid masking the smell with heavy sprays or fragrances — ventilation is far more effective.
Using essential oils can help add a nice scent to your mattress and keep it smelling fresh. Simply spray a mixture of water and essential oils onto the surface of the mattress before vacuuming it.
FAQs
Why does my new mattress smell so strong?
It’s likely due to concentrated VOCs being released after the mattress was sealed in plastic. The smell is strongest right after unboxing and reduces with airflow.
Is it safe to sleep on a mattress that smells?
For most people, yes. However, if you’re sensitive to smells, let it air out for 24 hours first.
How can I avoid mattress off-gassing altogether?
Look for:
- CertiPUR® certified foam
- OEKO-TEX® certification
- Natural fibre fillings
- Brands that openly publish material transparency
Also, consider buying a new mattress that comes with trial period of 100 up to 365 days. This way you test the mattress at home, and if for some reason you’re unsatisfied you can return it for a full refund.
In most cases, new mattress smell is normal, temporary, and not a cause for concern.
It’s simply part of the unboxing process — especially with foam mattresses. With good ventilation, the smell should fade within a couple of days.
If you’re particularly sensitive or buying for a child’s room, it may be worth considering a mattress made with natural materials or certified low-VOC foam.
But for the vast majority of sleepers, that “fresh out of the box” scent is short-lived — and a small trade-off for the comfort of a brand-new mattress.
