Pollen particle sizes typically range from 10 microns up to 200 microns — about the width of a human hair. That makes them pretty ‘large’, as far as particles go. Most trees have pollen that are in the range of 50 – 200 microns. The smallest pollen known measures 9 microns, the pollen of mimosa pudica. Because pollen particles are fairly large, most masks will capture a high percentage of it. Data shows that even surgical masks can capture up to 80% of tiny PM2.5 particles.
Click here to read more details and what else could you do to protect yourself in the pollen season: https://smartairfilters.com/en/blog/mask-purifier-protect-from-small-size-pollen-hayfever/