Different International standards for mask:
EN14683:
Type I BFE minimum 95%
Type II BFE minimum 98%
Type IIIR BFE minimum 98%, difference with type ii and type iir is made with splash resistance, aka synthetic blood resistance , which is not that important for ordinary people to use on street
ASTM F2100:
Level 1: BFE min 95% / PFE 95%
Level 2: BFE min 98% / PFE 98%
Level 3: BFE min 98% / PFE 98%
although you can see they have same BFE percentages, it doesnt mean it has the same standard as En14683, as ASTM F2100 also tested on different aspect of the masks, like flame spread while EN14683 tested microbial cleanliness
AS 4381:2015 <australian standard
no PFE tested
Level 1: BFE min 95%
Level 2: BFE min 98%
Level 3: BFE min 98%, but with more resistance to pressure
CNS14774 <Taiwanese masks but no export now>
(medical mask aka ordinary masks)
BFE 95%,
CNS14774 (surgical mask)
Level 1: BFE 95% / PFE 95%
Level 2: BFE 98% / PFE 98%
Level 3: BFE 98% / PFE 98%, with higher blood resistance (also mean that you dont need this high level in daily life, you wont have chance to deal with blood)
WHAT IS N95 THEN?
“NOISH approved N95” represents masks that have been approved by the US National Institute for Occupational Safety and Health (NOISH). “N” means the mask can only filter non-oily particles, 95 means 95% of micro-particles that are more than 0.3mm in diameter can be filtered.
N95 masks can be for industrial or surgical use. Don’t mix them up! One must undergo an inhaling examination to find out which mask is appropriate for their use, thus maximising N95’s effectiveness! The most ideal masks are those that have been certified for surgical use. For references the US’s Food and Drug Administration provides more information. The Consumer Council in Hong Kong also has supplementary materials on masks, washing liquid, wet wipes and hand sanitisers.