The time to suffer from hay fever is over. This time mask is indispensable. It is one of pollinosis prevention goods which is fit for walking with little invasion from the gap because it fits nose without passing pollen.
It is just right because the eyes are coarse and not stuffy. I personally think that there are few effects on hay fever measures and PM 2.5 countermeasures, but it is most suitable for work in relatively dusty places.