we breathe out aerosols,

Indeed we do. But what happens to those droplets when they hit the mask? The liquid soaks in, evaporates and frees a million viruses. Then you breathe in.

The other problem with "surgical" masks is that they are made cheaply by spraying random fibres and sticking them with glue to form the material. Some fibres remain loose for you to breathe in. Many more fibres become loose with use and, especially, with washing. Then you breathe in the fibres. That causes, potentially, interstitial lung disease (which is nasty).

Download and read https://files.catbox.moe/prkeo3.pdf

we breathe out aerosols,

Indeed we do. But what happens to those droplets when they hit the mask? The liquid soaks in, evaporates and frees a million viruses. Then you breathe in.

The other problem with "surgical" masks is that they are made cheaply by spraying random fibres and sticking them with glue to form the material. Some fibres remain loose for you to breathe in. Many more fibres become loose with use and, especially, with washing. Then you breathe in the fibres. That causes, potentially, interstitial lung disease (which is nasty).

we breathe out aerosols,

Indeed we do. But what happens to those droplets when they hit the mask? The liquid soaks in, evaporates and frees a million viruses. Then you breathe in.

The other problem with "surgical" masks is that they are made cheaply by spraying random fibres and sticking them with glue to form the material. Some fibres remain loose for you to breathe in. Many more fibres become loose with use and, especially, with washing. That causes, potentially, interstitial lung disease (which is nasty).