Test Procedures of Mobile Air Cleaning Devices - First Experiences and Results Christian Friebe, Ralph Krause, Ralf Heidenreich, Stefan Holfeld, Hanes Rosenbaum, Karsten Hackeschmidt and Rebekka Gruttner E3S Web Conf., 343 (2022) 03004 Published online: 08 March 2022 DOI: 10.1051/e3sconf/202234303004