Can microplastics in your airway trigger allergic asthma and inflammation?

What's actually in it

Indoor air contains microplastic fibers and fragments shed by synthetic clothing, carpets, furniture, and bedding. These particles are small enough to be inhaled deep into the lungs. They deposit on the airway lining, the thin layer of cells that protects your respiratory system from foreign particles and allergens.

People spend about 90% of their time indoors, breathing in these particles continuously.

What the research says

A 2026 review in Front Allergy examined how microplastics affect airway epithelium, the lining of the airways. The evidence shows that microplastics damage the epithelial barrier, trigger inflammatory cytokine release, and promote the type of immune response associated with allergic asthma.

When the airway lining is damaged, allergens like pollen and dust mites penetrate more easily, making allergic reactions worse. The microplastics also directly activate immune cells in the lungs, creating inflammation even without allergens present.

For people with asthma or allergies, microplastic exposure from indoor air may be making symptoms worse. HEPA air purifiers, frequent wet cleaning, and choosing natural fiber textiles help reduce airborne microplastic levels in your home.