How does Audi's Air Quality Package filter out harmful pollutants?

I am considering purchasing an Audi A8 and I want to know more about the Air Quality Package. What kind of pollutants does it filter out and how does it do this?

The Audi A8's Air Quality Package uses a highly efficient particulate filter to capture harmful pollutants, such as dust and pollen, from entering the cabin. It also features an activated carbon filter that absorbs gaseous pollutants from the outside air.