Only P100 full face respirators protect the person wearing them. Masks do one thing and one thing only they reduce the 10+ micron sized aerosol particles emitting by the person wearing the mask. That’s it nothing more. This is the reason doctor’s by law have to wear them during surgery it is to prevent particles from the doctor’s falling into the cut open patient. The reason for masks is that upwards of 40% of those positive for the Rona are asymptomatic but they are ABSOLUTELY infectious for upwards of ten days producing millions of airborne particles simply by breathing. Surgical masks and cloth masks capture those particles upwards of 90% of them from the person producing them they do next to zero for filtering incoming particles of under 10 microns and those are the ones that wind can spread for many feet. Simple rest easy for anyone to do. Place a lit candle 2 meters away and without a mask blow it out the average person can fairly easily. Now from the same two meters put on a cloth mask and blow.as hard as one can nearly no one will be able to blow that.candle out the mask has trapped and dispersed the outgoing currents of air from the lungs this cutting the distance that any particles can travel by a significant margin. Most people can not even blow a candle out at 25 cm this is how masks work and why Japan with it’s mandatory masks and also a culture of using them has a fraction of the deaths and cases the USA does their population density is higher than NYC yet they have a fraction of the cases per 100000 vs NYC masks are the reason they never did a lockdown not shut down subways for more than a few weeks. Masks work on a mass scale due to the capture of particles coming from infected people they do nothing for the person wearing them should they get to close to someone’s virus plume.