Study reveals multilayer masks most effective at preventing aerosol generation India Updated: Saturday, March 6, 2021, 11:33 [IST] Bengaluru, Mar 06: Multilayer masks are most effective at preventing aerosol generation, says a new study conducted by a team led by researchers at Bengaluru-based Indian Institute of Science (IISc). The study was carried out in collaboration with scientists in UC San Diego and University of Toronto Engineering. According to IISc, when a person coughs, large droplets (>200 microns) hit the inner surface of a mask at a high speed, penetrate the mask fabric and bre...