A new analysis has found that tumble drying a load of laundry released microfibers into the air at a level comparable to the amount of microfibers released down the drain during machine washing of the same load—but fabric conditioners and lint filters with smaller pore size reduced release from dryers. Dr. Neil Lant and colleagues from Procter and Gamble and Northumbria University, U.K., present these findings in the open-access journal PLOS ONE on April 6, 2022.