ASTM level is at least level one, Level 2 is mid-level protection and level 3 is highest level. Level 2 and 3 is ideal one. VFE and PFE is most important 3 layers Earloop surgical mask Europe / America standard ASTM AT LEAST level 1 or EN14683 Asia Pacific standard PFE level > 99% ( most important) VFE level > 99% ( most important) BFE level > 99% Show More