There are still many people unclear on what masks to use during the current haze environmental problem. While normal 3-ply surgical masks or even handkerchiefs may give a sense of protection, they are in actual fact not good for filtering…
There are still many people unclear on what masks to use during the current haze environmental problem. While normal 3-ply surgical masks or even handkerchiefs may give a sense of protection, they are in actual fact not good for filtering…