Researchers have shown the most difficult size particle for masks to capture operate through Brownian motion. This does not mean masks filtering 0.3 micron-sized particles are unable to filter smaller particles.
According to research, all six types of N95 respirators can filter particles less than 0.1 microns in size with a minimum efficiency of 94 percent.
Research also showed the FFP2 mask is capable of filtering particles 0.0007 microns in size at 96.6 percent efficiency.
This research suggests the FFP2 mask may be more effective for protection against the coronavirus than the N95 mask. More research is still required for a definitive answer to the FFP2 vs N95 mask debate. end quote
