Harvard T.H. Chan School of Public Health (Nov 20) empfehlen Luftfilter an Schulen
„you could use a portable air cleaner with a HEPA filter to clean the air indoors, and it would help remove airborne particles, including airborne viral particles.“ Gesamtübersicht: https://luftfilterbonn.wordpress.com/studien-luftfilter-schulen-kitas-fakten/
джерело : Healthy Buildings Program (USA), Harvard T.H. Chan School of Public Health, Assistenz-Prof. Dr. Joseph G. Allen