Does an old foam couch pollute the house more than a brand new one?
Often yes. The new-couch smell fades in weeks, but the chemical reaction that makes formaldehyde keeps going for years and warm rooms speed it up.
What's actually in it
Couch and recliner cushions are polyurethane foam. People assume the new-couch smell is the worst part. The smell does fade, but the chemistry behind it doesn't. Oxygen in the air keeps reacting with the foam's building blocks. The reaction breaks off small chemicals like formaldehyde, acetaldehyde, and acrolein. The reaction is slow but steady, and it speeds up in warm rooms and on worn cushions.
What the research says
A 2026 kinetics study in Polymers measured how soft polyurethane foam keeps making these VOCs over time. The reaction did not stop after the new-couch smell faded. Output was higher in warmer rooms and on cushions that had been compressed many times. So a 5 year old couch in a hot apartment can pollute as much or more than a brand new one in a cool basement.
Crack windows and run a fan when the room warms up. Vacuum cushions often. When buying, look for natural latex, wool, or cotton fills with a GREENGUARD Gold or OEKO-TEX certificate. Brands like Burrow, Medley, Cisco Home, and Avocado sell low-VOC sofas.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| A Kinetic Study of the Autoxidative Formation of VOCs, Including Formaldehyde, Acetaldehyde and Acrolein from Polyurethane Soft Foams | Polymers (Basel) | 2026 |
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