Can washing machine lint from synthetic clothes cause lung inflammation?

What's actually in it

Synthetic fabrics like polyester, nylon, and acrylic shed tiny plastic fibers every time you wash them. These microfibers are so small they float through the air in your laundry room and settle on surfaces throughout your home. You breathe them in without realizing it.

The fibers are made of the same plastics found in food packaging and water bottles. But because they're thin and lightweight, they travel deep into your lungs where larger particles can't reach.

What the research says

A 2026 study in Environ Res exposed lung tissue to microfibers collected from washing machine lint. The results were striking. Repeated exposure caused chronic lung inflammation and impaired the ability of immune cells called macrophages to do their job.

Macrophages are the cells that clean up debris in your lungs. The microfibers essentially clogged them up. When macrophages can't function properly, your lungs lose their ability to clear infections and pollutants. The study also found signs of mitochondrial DNA damage, suggesting the fibers affect cells at the deepest level.

The scariest part: this wasn't extreme exposure. The researchers used concentrations meant to mimic what people actually breathe at home. If you're doing laundry in a small, poorly ventilated room, your exposure could be even higher.