Formaldehyde has a sharp, pungent odor that’s often described as chemical and slightly suffocating. In clothing, it’s the harsh, acrid smell you notice when you open a package of new garments, particularly those labeled wrinkle-free, permanent press, or non-iron. The scent is detectable even at very low concentrations (below 1 part per million), and it tends to hit your nose and eyes at the same time, sometimes causing an immediate stinging sensation.
How to Recognize It
Formaldehyde doesn’t smell like mildew, mothballs, or the generic “new clothes” scent of dyes and sizing agents. It’s more aggressive than any of those. The closest everyday comparison is the sharp, eye-watering smell of a nail salon or a high school biology lab. If picking up a new shirt makes your eyes water, your nose burn, or your throat feel scratchy, formaldehyde is a likely culprit.
One key distinction: mildew smells earthy and damp, while formaldehyde smells distinctly chemical and dry. Mildew gets worse in humid, enclosed spaces. Formaldehyde off-gassing is strongest when you first open the packaging and decreases as the garment airs out. If the smell lingers after multiple washes and days of airing, it’s worth considering another source, but formaldehyde in fabric can be persistent in heavily treated items.
Why Clothing Contains Formaldehyde
Formaldehyde-based resins have been applied to clothing fabrics since 1926 to make them resist wrinkles. These resins cross-link with the cotton or cotton-blend fibers so the fabric bounces back to its original shape after folding or wearing. That’s what makes a “permanent press” or “wrinkle-free” shirt look crisp straight out of the dryer.
Beyond wrinkle resistance, formaldehyde treatments also help prevent shrinkage, improve color fastness, and resist mold during long shipping and storage periods. Garments manufactured overseas and shipped in sealed containers for weeks are especially likely to carry higher residual levels, because the chemical has no opportunity to dissipate during transit.
The types of clothing most likely to contain noticeable formaldehyde include non-iron dress shirts, bedsheets marketed as wrinkle-free, polyester-cotton blends, and heavily dyed or printed fabrics. Children’s clothing in many countries is subject to stricter formaldehyde limits, but adult clothing often has no mandatory cap in the United States.
What It Can Do to Your Body
The smell itself is your first warning. Inhaling formaldehyde vapors from clothing can cause eye irritation, a runny or burning nose, sore throat, and nausea. People with asthma may notice their symptoms worsen. These reactions can happen even at low concentrations, and people who are already sensitized to formaldehyde may react before the smell becomes obvious to others.
Direct skin contact is the other concern. Formaldehyde resins can trigger allergic contact dermatitis, a red, itchy rash that typically appears where the fabric presses tightest against the skin: the neck, inner arms, waistband, and thighs. Research suggests that formaldehyde levels below 200 parts per million in fabric are safe for most people, and most modern textiles fall under that threshold. But if you’re already sensitized through workplace or environmental exposure, even lower concentrations can cause reactions.
How to Get Rid of the Smell
Washing new clothes before wearing them is the single most effective step. A standard wash cycle with regular detergent removes roughly 60% of the formaldehyde from fabric. That’s a significant reduction in one wash, but it means about 40% can remain, so sensitive individuals may need to go further.
Several methods can boost removal:
- Baking soda soak. Dissolve a cup of baking soda in water and let the garment soak overnight before running it through a normal wash cycle.
- White vinegar rinse. Add a cup of white vinegar to the rinse cycle. The mild acid helps break down residual resin.
- Borax in the wash. Add a cup of borax at the start of the load alongside your usual detergent.
- Outdoor airing. Hang the clothing outside for at least 12 hours. Sunlight and airflow help the chemical off-gas and dissipate naturally.
If you have sensitive skin or eczema, repeating these steps two or three times is a good idea. Some people combine methods, soaking overnight in baking soda, then washing with borax, then hanging outside. The smell should be undetectable after two to three full rounds. If it persists, the garment likely has a heavier-than-average resin treatment, and returning it may be more practical than continuing to wash it.
Clothing Least Likely to Smell
If you want to avoid the issue entirely, look for garments made from 100% untreated cotton, linen, silk, or wool. Organic certifications like GOTS (Global Organic Textile Standard) and OEKO-TEX Standard 100 test for formaldehyde and set strict limits. Clothing that wrinkles easily is, ironically, a good sign: it probably hasn’t been treated with formaldehyde resins. The trade-off is more ironing, but no chemical off-gassing against your skin.