Can breathing in microplastics cause lung scarring?

What's actually in it

Airborne microplastics come from synthetic clothing, carpet fibers, plastic packaging, and household dust. They're invisible to the naked eye but present in every indoor air sample tested. You inhale them with every breath, and they settle deep in your lungs.

Your lungs have delicate air sacs that exchange oxygen and carbon dioxide. When foreign particles get stuck there, your immune system tries to wall them off with scar tissue. Over time, this scarring stiffens the lungs and makes breathing harder.

What the research says

A 2026 study in Toxicology tested different types and sizes of plastic particles to see which ones cause the most lung damage. They used both cell cultures and live animals to compare the effects.

Nanoplastics (the smallest particles) caused more fibrosis than larger microplastics. Their tiny size lets them penetrate deeper into lung tissue and trigger a stronger immune response.

The type of plastic also mattered. Polystyrene particles caused more damage than some other types, but all plastics tested triggered some degree of fibrotic response in lung cells.

The scarring process involved inflammatory signals that activated fibroblasts, the cells that produce collagen and scar tissue. Once this process starts, it's hard to reverse. Chronic low-level exposure, like breathing indoor air full of microplastics, could slowly damage your lungs over years.