Surgical masks block particles as small as 3 micrometers, so they do a great job catching those pesky pollen grains that make you sneeze (which are around 10 micrometers). Even cloth masks will help. So grab your mask when you’re going to do yard work, hang out in the garden, or go for a walk outdoors, and you might find yourself considerably less sneezy. (Of course, the CDC wants you to keep wearing your mask in public anyway, allergies aside.)