According to years-long research on respiratory virii, half of your exhaled breath is an aerosol with particles <2.5um in size. Any one of these can infect any person, and they hang in the air for hours. Add to this that no mask is effective:
( A Cluster Randomised Trial of Cloth Masks Compared With Medical Masks in Healthcare Workers C Raina MacIntyre etal ): “Penetration of cloth masks by particles was almost 97% and medical masks 44%.”
Would medical mask be N95?