The air in urban areas contains large quantities of dust, pollen, soot and other particles, as well as gases which are harmful to health. More and more people are suffering from allergies and are increasingly aware of the subject of air conditioning and cabin filters. As a result, more vehicles leave the factory already fitted with cabin filters. The particle filter keeps dust and particles such as pollen, diesel soot or tyre dust away from the interior of the vehicle. It is important to obtain the maximum possible filtration performance in the space available. Through the special pleating technique, the actual filtration area is increased without having to change the size of the filter. Laboratory tests confirm that up to 95% of dust particles and pollen are almost completely retained.