Yes, only certain masks will even do anything. But... Even then you need to make sure the mask fits. In hospitals, they do tests to find the right fit for nurs

Yes, only certain masks will even do anything. But... Even then you need to make sure the mask fits. In hospitals, they do tests to find the right fit for nurses and doctors to check airflow. They can be a good tool in certain situations, but random people placing a bunch of faith in them over other solutions is probably not helping.