Microfibers from synthetic clothing aren’t just inundating waterways, a new report claims. They’re also infusing the air we breathe. Indeed, of the microplastics abundant in London’s air, 92 percent are “fibrous microplastics” from abraded plastic textiles such as clothing, upholstery and carpets, according to research published Saturday by King’s College London scientists. Microplastics, loosely defined…