Flame Retardants

Chemicals added to products to slow them catching fire. Brominated and organophosphate flame retardants are the main groups in everyday household items. They're meant to give people time to escape a fire — a good goal — but many of the chemicals used turned out to have serious health concerns of their own.

Furniture flammability standards (especially California's old TB117 standard, dropped in 2013) effectively required manufacturers to add huge amounts of flame retardant chemicals to foam furniture sold in the US for decades. Most furniture made before 2014 contains significant amounts.

Usually not on labels at all. The chemical families: PBDEs (polybrominated diphenyl ethers — banned/phased out), TBBPA, TCEP, TDCPP, Tris(1,3-dichloro-2-propyl)phosphate, Firemaster 550. Furniture might be labelled 'contains flame retardants' or 'no added flame retardants' (the latter is the one to look for).

Older foam furniture is the biggest single source. Couches, armchairs, and mattresses from before 2014, especially in the US. Also: electronics housings, older car seats, older nursing pillows, carpet padding. The flame retardants migrate out of these into household dust, which kids especially end up exposed to.

Mainly through inhaling and ingesting household dust. Kids who crawl on the floor pick up dust on their hands, then mouth their hands. PBDEs also bioaccumulate up the food chain, so fish and dairy products contribute.

PBDEs disrupt thyroid hormone, which guides fetal brain development. Studies link higher prenatal PBDE exposure to changes in child IQ and attention. The newer organophosphate flame retardants are increasingly raising similar concerns. Reducing dust exposure during pregnancy is the most practical lever.

Some research links higher flame retardant levels to altered hormone levels and reduced sperm quality. Effects look real but smaller than the pregnancy and child development signals.

Highest concern group, by a clear margin. Kids breathe and ingest more dust per kilo, mouth their hands, and crawl on the floor. The strongest links: thyroid effects, attention and behaviour, lower IQ. Children's body burden of PBDEs has historically been higher than adults'.

Bioaccumulation means older adults often have decades of body burden. Some thyroid links continue. Not the highest-priority group but real.

Strongest evidence is for thyroid hormone disruption (well-established) and neurodevelopmental effects in children (multiple cohort studies linking prenatal PBDE exposure to lower IQ and attention issues). Some flame retardants are listed as Persistent Organic Pollutants under the Stockholm Convention because they meet the criteria for persistence, bioaccumulation, and human health concern.

Higher than most chemicals on this list for families with kids and older foam furniture. Less significant for newer furniture and households without crawlers. Body burden has been declining since PBDE phase-outs but is still elevated in dust.

When buying new: look for 'no added flame retardants' on furniture and mattress labels (more common since 2014). Solid-wood furniture without foam. Wool or natural latex mattresses. For existing older furniture: dust control, slipcovers, hand-washing for kids.

Medium. Buying new flame-retardant-free is increasingly easy. Living with existing older furniture is harder — replacing a couch is expensive. Dust control and handwashing are the practical interim moves.

Vacuum (with HEPA filter if you have one) more often, especially in main living areas. Wash kids' hands before meals. These free actions reduce ingestion of flame-retardant-laced dust meaningfully.

If you have young kids and pre-2014 foam furniture, this is one of the higher-leverage chemicals on the list to think about. Dust control is free and reduces exposure substantially. When you next replace a couch or mattress, look for 'no added flame retardants'.

EPA on PBDEs and TSCA flame retardant evaluations, CDC biomonitoring data on flame retardants, NIEHS on developmental effects, and Stockholm Convention POPs listing. See References below.