Does microplastic exposure in your home change with the seasons?

What's actually in it

Airborne microplastics come from synthetic clothing, carpet, upholstery, curtains, and plastic products inside your home. Every time you move, sit down, or fold laundry, fibers get launched into the air. In summer, open windows let some escape. In winter, sealed homes trap them inside, and the concentration builds.

What the research says

A 2026 study in Chemosphere tracked indoor microplastic levels across seasons in homes in the UK. The researchers sampled indoor air and settled dust at different times of year and compared the concentrations.

Indoor microplastic levels were highest in winter and lowest in summer. The likely reason: homes in winter are sealed tight for heating. Windows stay closed, ventilation drops, and the plastic fibers shed by indoor sources have nowhere to go. They just keep accumulating.

In summer, natural ventilation from open windows dilutes indoor air and carries some particles out. The study found that homes with better ventilation had lower microplastic levels year-round.

The type of microplastics also varied. Polyester and nylon fibers from clothing dominated the indoor samples. Homes with more synthetic furnishings and carpets had higher levels regardless of season. Choosing natural fiber clothing, rugs, and curtains can reduce the baseline level of airborne plastic in your home.