Healthcare Indian scientists find N95 masks to be most effective at stopping COVID-19 spread Updated : August 26, 2020 03:01 PM IST The, study published in the journal Physics of Fluids, found N95 masks to be the most effective at reducing the horizontal spread of a cough. The N95 masks reduced a cough's initial velocity by up to a factor of 10, and limit its spread to between 0.1 and 0.25 meters, the researchers said. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.