(4) KN95 masks - Under the circumstances of unavailability ... The air masks are definitely effective, especially when it comes to N95 or FFP2/FFP3 masks. There are numerous researches to prove ...

with N95 masks as the most effective. KF94, KN95, double masks and fitted surgical masks are in the second tier: “more effective”. Surgical masks are at third and cloth masks with three or ...

But the Food and Drug Administration has also approved some KN95 and FFP2 masks made ... A 2013 study found that surgical masks were about three times as effective at blocking influenza aerosols ...