Home-made cloth face masks likely need a minimum of two layers, and preferably three, to protect against COVID-19, a new study finds.
Source: Face mask safety: Two or three layers best to protect against coronavirus, study finds – CNN
Home-made cloth face masks likely need a minimum of two layers, and preferably three, to protect against COVID-19, a new study finds.
Source: Face mask safety: Two or three layers best to protect against coronavirus, study finds – CNN