Disposable face masks (single use face masks) are produced from polymers such as polypropylene, polyurethane, polyacrylonitrile, polystyrene, polycarbonate, polyethylene, or polyester.
Microplastic or Nanoplastic particles in masks are breathed into the airways and can have damaging longterm effects on the health of the lungs.
Sharing a selection of articles on the dangers of inhalation of plastic particles:
Need for Assessing the Inhalation of Micro(nano)plastic Debris Shed from Masks
An emerging class of air pollutants: Potential effects of microplastics to respiratory human health?
You’re Probably Inhaling Microplastics Right Now
How damaging is breathing in microplastics?