That “fresh laundry” smell doesn’t stay in your clothes. It goes into the laundry room and out the dryer vent into the outdoor air. Here’s what researchers have measured, what nobody has measured yet, and one easy switch.
Evidence key Strong Moderate Weak How we grade
Most fragrance goes into soaps, cleaners and laundry products
By the industry's own figures, about 60% of fragrance goes into soaps, fabric softeners, cleaners and detergents, yet its 2003 method for estimating people's exposure counted only 10 personal-care products applied to skin, and breathing fragrance in was not part of the calculation. Strong evidence. Bickers 2003 (RIFM Expert Panel) Industry-funded
The label barely tells you what’s in it
In the US, laundry products aren’t even cosmetics in the eyes of the law. FDA names laundry detergents, fabric softeners, dryer sheets, and room and carpet fresheners as fragranced products that fall under the Consumer Product Safety Commission rather than FDA cosmetics regulation. Strong evidence. FDA 2026 (Fragrances in Cosmetics) The 2022 US cosmetics law does not cover air fresheners, cleaning products or laundry products at all. Strong evidence. MoCRA 2022
The best-selling US laundry detergent's label and safety sheet disclosed almost none of what it released; only ethanol was listed. Moderate evidence. Steinemann 2013
Even in Germany, where 26 fragrance allergens must be named above a set level, most scented detergents in one household study said only “perfume.” Even though EU law requires 26 specific fragrance allergens to be named individually above 0.01% concentration, 60% of the 1,447 scented detergents in this German household study listed only the generic term 'perfume', 'fragrance', or 'aroma' rather than naming any specific allergen, and only 46% named any of the 26 at all. Moderate evidence. Wieck 2018
Among all detergent types studied, laundry (textile) detergents had both the highest share of products naming a fragrance allergen (50.0% of 270 products) and the highest average number of named allergens per product (1.7) — ahead of dish soap, glass cleaner, toilet cleaner, and dishwasher detergent. Moderate evidence. Wieck 2018
What comes out of the dryer vent
Scented laundry products put fragrance chemicals into outdoor air: in two homes, limonene (a citrus scent chemical) came out of the dryer vent only when fragranced detergent or dryer sheets were used (up to 14.7 ug/m3), not in the no-product runs. Moderate evidence. Steinemann 2013
A six-home follow-up measured much higher levels at some vents. Dryer-vent air carried far more of the citrus-scent chemical D-limonene when households used fragranced laundry detergent (2.35-118 ug/m3, mean 33.34) than when they used fragrance-free detergent (0.13-1.50 ug/m3 after switching; 0.24-0.26 ug/m3 in households that never used fragranced detergent). Moderate evidence. Goodman 2019
Every one of 25 fragranced laundry products tested (US and Australian detergents and dryer sheets) emitted a terpene fragrance chemical (such as limonene, alpha-pinene or eucalyptol), while none of 10 fragrance-free laundry products emitted any terpene at all. Moderate evidence. Goodman, Nematollahi & Steinemann 2020/2021
Linked to musks in the body
Synthetic musks reach mothers and babies mainly through the skin (cosmetics and clothes washed in scented detergent), not through food. Moderate evidence. Schmeiser 2001
Mothers who used perfumed laundry detergent had significantly higher levels of the musk chemical tonalide (AHTN) in their breast milk than mothers who used unscented detergent. Moderate evidence. Lignell 2008
Who it bothers
Among people with symptoms, 56% named other people's perfume, 32% air fresheners and 28% other people's freshly washed (fabric-softened) clothes as triggers. Moderate evidence. Elberling 2005
Fragrance-free policies need to cover cleaning and laundry products, not just perfume: of 60 people who react to fragranced products, 50 named cleaning products, 47 perfume and 41 laundry products as persistent triggers. Moderate evidence. Roy 2026
Some groups report problems from dryer-vent scent far more often than others. Among people who get migraines, 40.8% (US) and 29.1% (Australia) report health problems from the scent of laundry products coming from a dryer vent, with asthma attacks the most frequently reported effect in this group. Moderate evidence. Goodman, Nematollahi & Steinemann 2020/2021 Among adults with a diagnosis of autism or autism spectrum disorder, 71.4% (US) and 51.2% (Australia) report health problems from the scent of laundry products coming from a dryer vent — the highest prevalence of any group measured (general population, asthmatics, autistic adults, migraineurs) in either country. Moderate evidence. Goodman, Nematollahi & Steinemann 2020/2021
What nobody has measured yet
We looked for studies on how much fragrance stays in clothes after washing, what scent boosters give off, and what people living near a dryer vent actually breathe. We haven’t found any, so we won’t pretend to know. The fabric softener question is open too. No published study has been found that tests whether quaternary ammonium compounds specifically from laundry fabric softeners or dryer sheets, as opposed to disinfectant or cosmetic-preservative exposure, cause asthma or skin sensitization in consumers. Weak evidence. Peyneau 2022
None of that is a reason to keep using scented laundry products. It’s a reason to ask why they were sold for decades while those basic questions went unanswered. More gaps like these are on what the science doesn’t know yet.
One switch cuts what comes out of the vent
In the homes that switched, the difference showed up within a month. Switching from a fragranced to a fragrance-free laundry detergent cut the fragrance chemical D-limonene coming out of the dryer vent by up to 99.7% (mean 79.1%) within one month, in real households, with no extra cost or apparent inconvenience. Moderate evidence. Goodman 2019
Switching to fragrance-free laundry detergent also reduced D-limonene in the laundry room's own indoor air, not just at the dryer vent, by up to 72.7% (mean 45.8%) within one month. Moderate evidence. Goodman 2019
A headspace test of the fragranced and fragrance-free versions of the same detergent brand found 34 volatile chemicals in the fragranced version but only 7 in the fragrance-free version, and no fragrance terpenes (such as D-limonene or linalool) at all in the fragrance-free version. Moderate evidence. Goodman 2019
It may matter for babies too. Because galaxolide (HHCB) levels in milk tracked perfume use and tonalide (AHTN) levels tracked scented-laundry-detergent use specifically, choosing fragrance-free perfume and fragrance-free laundry detergent during pregnancy and breastfeeding are each independently plausible ways to lower the corresponding musk chemical passed to a nursing infant. Moderate evidence. Lignell 2008
How to find a real fragrance-free detergent
“Unscented” and “fragrance-free” don’t mean the same thing, and on laundry products they may not mean much at all. Health Canada's cosmetic labeling guidance on 'unscented'/'fragrance-free' does not cover laundry detergent, fabric softener or dryer sheets; Canada's legal definition of 'cosmetic' (Food and Drugs Act s.2) covers products for the complexion, skin, hair or teeth, not fabric. Moderate evidence. Health Canada 2026
Two labels have written rules you can check. Under the EPA's Safer Choice program, 'fragrance-free' and 'unscented' are not the same claim: 'unscented' still allows a masking chemical added to cover other ingredients' smell, while 'fragrance-free' specifically bars masking scents as well as added scent. Moderate evidence. US EPA Safer Choice A product carrying the EPA Safer Choice 'fragrance-free' label can still have a smell, because ordinary functional ingredients such as surfactants and solvents can carry an odor without being classified as a fragrance material. Moderate evidence. US EPA Safer Choice
The National Eczema Association's Seal of Acceptance requires products to be fully fragrance-free — "there should be no discernable/strong scent or anything aromatic in nature in the final product" — with no stated exemption for masking fragrance, and NEA directly checks a physical product sample for absence of scent as part of the review. Strong evidence. NEA 2026
What you can do
- Switch to a fragrance-free detergent, and skip fabric softener, dryer sheets and scent boosters. Look products up in EWG’s Guide to Healthy Cleaning.
- Check the label with our label decoder, and read why “unscented” isn’t fragrance-free.
- Share a laundry room? Our letter builder writes a polite note for your landlord or building manager.
- More in our fragrance-free shopping guide and the laundry section of room by room.
Every claim above shows its evidence grade and names its source. See all the laundry facts and the claims we won’t make. Information, not medical advice.