It keeps the air that you breathe inside the cabin clean. They are engineered to trap a whole bunch of things, including pollen, dust, mold spores, smoke, soot and smog-none of which belong in your nose.
It keeps the air that you breathe inside the cabin clean. They are engineered to trap a whole bunch of things, including pollen, dust, mold spores, smoke, soot and smog-none of which belong in your nose.