Outside air flowing through the vehicle’s ventilation system can expose passengers to road dust and pollen. Eco Maxx Cabin Air Filters can filter 98% of these contaminants (particles ranging from 2-100 microns). Each Eco Maxx Cabin Air Filter contains one layer of PollenTec filtration material, two layers of Poly-Flo filtration media and an optional layer of oer absorbing carbon media design to absorb odors and freshen the air. PollenTec is material is certified and hospital clean room tested for its effectiveness in capturing air borne particulates.