@krnel even if we should say the nose mask is healthy to use and it prevents the Virus, let me say this, many people here in Nigeria cannot afford the real nose mask because it cost close to 1 dollars and it's supposed to be disposable. So many people now improvise, using different fabric materials to sow the nose mask.
In my own opinion, I believe what you have highlighted is right and I find it almost impossible to breathe well when i use the mask. It's as if I am lossing my breathe.
None of that really helps. The cough and sneezes put out water droplets that fall to the ground shortly after. They don't persist in the air.