Does tumble drying increase microplastic shedding?

Yes, tumble drying dramatically increases microfiber release from synthetic clothing. Research has shown that tumble drying can increase microplastic shedding by 3.5 times compared to line drying. The combination of heat, friction, and tumbling action weakens synthetic fibers and breaks them into tiny fragments that become airborne or collect in the dryer lint trap.

What many people do not realize is that dryer lint is largely composed of microplastic fibers. These particles do not stay in the lint trap; a significant portion escapes through the exhaust vent and becomes part of your indoor air. Studies have found that indoor microplastic concentrations can be 10 to 100 times higher than outdoor levels, and dryer exhaust is a major contributor.

If you still own synthetic garments, air drying them can meaningfully reduce shedding. Better yet, transitioning to natural-fiber clothing eliminates the problem entirely. Brands on ONDU like Tripulse and Reprise Activewear use Tencel and other plant-based fibers that shed only biodegradable particles, keeping your air and water cleaner.