Fabric softeners and dryer sheets were among the worst offenders. A single dryer sheet can release dozens of chemicals, many of them in the fragrance category labeled simply as “parfum” or “fragrance” on the label — a loophole that allows manufacturers to keep exact ingredients secret.
Among the chemicals commonly detected:
– **Acetaldehyde** – probable carcinogen, respiratory irritant
– **Benzene** – known carcinogen
– **Ethyl acetate** – neurotoxin, eye and respiratory irritant
– **Limonene & linalool** – “natural” fragrance compounds that react with ozone in the air to form formaldehyde and ultrafine particles
– **Quaternary ammonium compounds (quats)** – the softening agents themselves, linked to asthma and skin irritation
When you vent your dryer outdoors (as most people do), these chemicals are released into the neighborhood. When you use an unvented dryer or bring clothes inside immediately, they off-gas directly into your living space for hours — sometimes days.
Worse Than Outdoor Air — By a Lot