A pilot study on measuring the consecutive macro air gap between three types of masks and a female face

Hygiene masks are often worn as simple personal protection equipment to protect oneself from PM2.5 particles, coarse particles, and pollen in our daily lives and at work. In recent years, mask sheet materials with higher protective performances have been developed. However, it has been shown that a poor fit between the mask and the wearer’s face often occurs. Therefore, it has often been observed that there are masks where there is a macro air gap between the mask and the wearer’s face. In this paper, the consecutive macro air gap between the mask and a female face was calculated using 3D coordinates.