How To Speed Up Mattress Off-gassing: Practical FAQ Guide

If you’ve just unboxed a new mattress and noticed a strong “new mattress smell,” you’re in the right place. This FAQ explains how to speed up mattress off-gassing, why it happens, and what you can safely do to reduce odors faster.

What is mattress off-gassing?

Off-gassing is the release of trapped manufacturing odors from a new mattress into the air. It’s especially common with foam mattresses, but many types can have some level of smell when first unpacked.

These odors usually come from volatile compounds used during production and from packaging materials. The scent is often described as chemical, plasticky, or just “new.”

Off-gassing is typically strongest in the first few days and then fades as air circulates around the mattress.

Why does it matter to speed up off-gassing?

Many people want to know how to speed up mattress off-gassing because:

The smell can be unpleasant in a bedroom.
Some sleepers prefer not to sleep directly on a mattress that still smells strongly.
Small or poorly ventilated rooms can hold onto odors longer.

While the smell normally lessens on its own, there are simple steps that can help it dissipate more quickly, making the mattress more comfortable to use.

How can I speed up mattress off-gassing right after unboxing?

Here are the most effective basic steps to speed up mattress off-gassing:

Unbox it immediately:
Don’t leave the mattress sealed in plastic any longer than necessary. Open the packaging as soon as you can so odors can start escaping.
Place it in a well-ventilated room:
Choose a room where you can open windows or run fans. Airflow is one of the most important factors for faster off-gassing.
Let it breathe uncovered:
Avoid putting sheets, protectors, or toppers on the mattress right away. Leave it completely bare for at least several hours, and preferably a full day or more, so air can reach the surface.
Use cross-ventilation:
Open windows on opposite sides of the room if possible and run a fan to push air across the mattress.
Flip or rotate (if allowed):
If your mattress design permits it, carefully rotate or flip it once or twice over the first couple of days so all sides get fresh air.

Are there any tricks to reduce the smell even faster?

Beyond basic ventilation, some people find these methods helpful:

1. Use fans and air circulation

Point a box fan or oscillating fan directly at the mattress on a low or medium setting. Air moving across the surface can help carry odors out of the room.

If possible:

Position one fan blowing fresh air into the room.
Use another fan or open doorway to push air out.

2. Air it out in a larger space

If you have access to a larger, less-used room or an open space where the mattress can stay dry and protected from the elements, airing it out there for a day or two may help the smell disperse more quickly.

3. Use a gentle room-odor strategy (not on the mattress)

You can:

Place bowls of baking soda or activated charcoal in the room (not directly on the mattress fabric unless you plan to vacuum carefully afterward).
Run an air purifier in the same room if you already own one.

These steps focus on freshening the air, not masking the mattress itself. Avoid heavy sprays directly on the mattress, which can leave residues.

Should I put baking soda directly on the mattress?

Some people sprinkle a light layer of baking soda directly on the mattress surface, let it sit for several hours, then vacuum it up with a clean upholstery attachment.

If you try this:

Use only a thin, even dusting, not a thick layer.
Make sure the mattress cover is dry before applying.
Vacuum thoroughly so no powder is left behind.

This approach may help absorb some surface odors, but airflow and ventilation are usually more important for overall off-gassing.

Can I sleep on a mattress that’s still off-gassing?

You generally can sleep on a new mattress while it’s off-gassing, but many people prefer to wait until the smell has softened. If you’re sensitive to odors, you might want to:

Air the mattress out in another room for 24–72 hours before regular use.
Use clean, breathable sheets and a light, washable protector once the initial smell has faded.

If the odor feels too strong for comfort, continue airing it out and increase ventilation.

What should I avoid when trying to speed up off-gassing?

To protect your mattress and keep things simple, avoid:

Heat sources like hairdryers or heaters pointed directly at the mattress. Excessive heat can damage foam and fabrics.
Strong chemical cleaners or sprays used directly on the surface. These can add new odors and residues.
Sealing the mattress too soon under thick mattress pads or multiple protectors; this can trap odors and slow down the process.

Keeping your approach gentle and focused on airflow tends to work best.

How long does mattress off-gassing usually last?

Off-gassing is usually most noticeable in the first few days. Many sleepers find the scent becomes much milder within a week, especially with good ventilation.

If you have followed the steps on how to speed up mattress off-gassing and the smell is still very strong after an extended period, you may choose to continue airing it out longer or move it to a better-ventilated area until it’s more comfortable for you.

✅ Quick Mattress Takeaways

Key points about how to speed up mattress off-gassing:

Unbox quickly: Remove plastic right away so odors can escape.
Ventilation is essential: Open windows, use fans, and aim for strong airflow.
Let it breathe bare: Keep sheets and protectors off at first so air can reach the full surface.
Consider gentle extras: Light baking soda and room ventilation can help with odor.
Avoid harsh methods: No high heat or strong chemicals directly on the mattress.
Be patient but proactive: Off-gassing usually fades with time, and these steps simply help it happen faster.

Using these simple strategies, you can speed up mattress off-gassing and ease into sleeping on your new bed more comfortably.