The filters offer a basic separation of particulates from incoming air. The Particle Filters by Mann-Filter can extract up to 95% of harmful particulate so that you can enjoy clean, healthier air inside the car. These filters are designed to prevent the build-up of dirt inside the air conditioning system, increasing its life. Nearly all fine PM2.5 particulates (up to 96%) – the damaging micro-organisms contained in pollen, exhaust fumes, smoke, fossil fuel emissions and gas droplets can be separated by cabin air filter from Mann-Filter. The pollen filter is powerful and effective to filter particles smaller than 3% of the diameter of human hair.