Schiphol is conducting a pilot to reduce ultrafine particles on the airport's apron. During this test, air will be cleaned by an innovative installation that has been installed next to Pier D. Piloting this special air filtration system is one of the ways in which Schiphol is improving working conditions at the airport. The special air filtration device developed by Van Wees Innovations creates airflows that cause ultrafine particles to clump together and form larger particles that can be filtered. During this new pilot on the apron, we will be investigating whether this machine also works outdoors. (....)