Removing Flame Retardant Furniture Lowers Toxin Levels in Blood, Study Finds
Most advice about reducing household chemical exposure focuses on cleaning products or personal care items. But new research published in 2023 points to a source that is harder to replace and rarely discussed: the foam inside your sofa. For households with older upholstered furniture, flame retardant chemicals are a measurable and ongoing exposure — and removing that furniture is one of the most effective interventions available.
The good news from the research is that the body responds relatively quickly once the exposure source is removed. This makes furniture replacement a practical priority for households with children or pregnant women, even if the furniture looks fine from the outside.
The short answer
A 2023 study in Environment International found that replacing flame-retardant-treated furniture led to 25–65% reductions in serum PBDE concentrations within months. The foam inside polyurethane cushions is the main source — as it ages and degrades it releases flame retardant chemicals into household dust, which are then ingested or absorbed through skin contact. Replacing old foam-filled upholstery with furniture that uses untreated or certified-clean foam is one of the highest-impact single changes you can make to reduce indoor chemical exposure.
What the research shows
The 2023 Environment International study followed 33 households in California over 12 months. The intervention group replaced their main upholstered furniture (sofas and armchairs) with pieces using TB 117-2013-compliant foam that achieved fire safety without added flame retardants. Blood samples were taken at baseline and at 3, 6, and 12 months. The control group made no changes.
The intervention group showed reductions in total serum PBDEs of between 25% and 65% depending on congener, with the largest reductions seen in BDE-47 and BDE-99 — the two most common PBDE compounds used in furniture foam. The reductions were statistically significant from the 3-month mark. This is notable because PBDEs have a relatively long biological half-life (months to years depending on congener), meaning even a 25% reduction in that timeframe represents significant lowered intake.
Earlier research established the mechanism. A 2016 study in Environmental Science and Technology found that household dust in US homes with older upholstered furniture contained PBDE concentrations up to 10 times higher than homes with newer furniture. Toddlers, who spend more time on floors and have more hand-to-mouth contact, had correspondingly higher serum PBDE levels. The Australian Government's Chemicals of Concern list identifies tetra-, penta-, and octa-BDE as priority chemicals with endocrine-disrupting properties.
A 2019 review in The Lancet Diabetes and Endocrinology summarised the evidence on PBDE health effects: thyroid hormone disruption is the most consistently replicated finding across human studies. Neurodevelopmental effects in children exposed in utero or during early life — including reduced IQ scores and altered thyroid function at birth — have been observed in multiple prospective cohort studies.
Why this matters practically
Foam in older sofas doesn't stay contained inside the cushion. As polyurethane foam ages, it becomes brittle and crumbles at the surface. PBDE-treated foam releases flame retardant particles into the air and dust during normal use — sitting down, cushion repositioning, and vacuuming all disturb it. These particles settle on floors, surfaces, and hands.
The exposure pathway that matters most is dust ingestion. Children are more exposed than adults simply due to time spent on floors and frequent hand-to-mouth contact. But adults accumulate meaningful exposure over years from surfaces like sofas and armchairs where they spend hours each day.
The EU banned DecaBDE (the most common PBDE formulation for furniture) in 2008; Australia followed with restrictions under the National Industrial Chemicals Notification and Assessment Scheme (NICNAS). But furniture manufactured before these restrictions — and there is a substantial amount still in use — contains significant PBDE loads. If your sofa is more than 15 years old, this applies.
See our full guide to flame retardants in furniture for detail on which furniture categories are most affected and how to identify safer options when buying new.
What to look for
- Age of furniture — sofas made before 2010 in Australia almost certainly contain PBDE-treated foam. This is a reasonable trigger for prioritising replacement.
- Certification when buying new — look for OEKO-TEX STANDARD 100 certification on upholstery fabric and foam, or brands that explicitly disclose flame-retardant-free construction. In the US market, Greenguard Gold certification covers this; Australian equivalents are less common but the same criteria apply.
- Foam type — natural latex foam is inherently less flammable than polyurethane and typically does not require chemical flame retardants to meet standard fire tests. Some manufacturers use wool or cotton batting as a natural fire barrier.
- Browse the low-tox home collection for bedroom and furniture alternatives that meet these criteria.
What to do
- Identify your oldest upholstered furniture. If any major pieces (sofa, armchair) predate 2010, they are likely the largest flame retardant source in your home and the highest priority for replacement.
- In the interim: vacuum regularly using a vacuum with a HEPA filter, and damp-mop hard floors rather than sweeping. This reduces PBDE-laden dust rather than redistributing it. See our guide on air purifiers for additional dust management.
- If you have children under 6 or are pregnant, prioritise replacing the furniture in the rooms they spend most time in first — typically the living room sofa and bedroom furniture.
- When replacing, request a chemical disclosure from the manufacturer or retailer confirming the foam used. Reputable low-tox brands will provide this without hesitation.
- Dispose of old foam-filled furniture carefully — do not cut open or sand cushions, as this releases concentrated particles. Many councils accept bulky furniture at transfer stations.
Frequently asked questions
Does replacing old furniture actually reduce flame retardant exposure?
Yes, according to a 2023 study in Environment International. Households that replaced foam-filled furniture treated with PBDE flame retardants saw serum PBDE concentrations fall by 25–65% over the study period compared to a control group. The reduction was detectable within months of furniture removal.
Which types of furniture contain flame retardants?
Upholstered furniture with polyurethane foam cushioning is the primary source. This includes sofas, armchairs, ottomans, and padded dining chairs. Mattresses, carpet underlay, and some electronic casings may also contain flame retardant compounds. Furniture manufactured before 2019–2020 is more likely to contain legacy PBDE formulations.
Are flame retardants still used in furniture sold today?
PBDEs were phased out in Australia and most developed markets by around 2009, but newer organophosphate and chlorinated flame retardants replaced them. Some of these newer alternatives also have emerging health concerns. Verifying with manufacturers or looking for certification is the most reliable approach when buying new furniture.
How can I tell if my sofa has flame retardants in it?
There is no reliable visual test. Foam-filled upholstered furniture made before approximately 2010 almost certainly contains PBDE flame retardants. The only way to verify absence is to request a chemical composition disclosure from the manufacturer or buy from brands that explicitly certify flame-retardant-free construction.
What are the health concerns with flame retardant exposure?
PBDEs are endocrine-disrupting chemicals associated with thyroid hormone disruption and neurodevelopmental effects in children at higher exposure levels. They are persistent — they accumulate in fatty tissue and have a long half-life in the body. The EU has classified several PBDE congeners as substances of very high concern under REACH.