Universität Peking: Luftfilter sind 95% wirksam
According to our previous measurements, the efficiencies of HEPA are more than 95% for aerosols of diameter between 0.25 and 1.0 μm and nearly 100% for those with diameter larger than 2.5 μm… Gesamtübersicht: https://luftfilterbonn.wordpress.com/studien-luftfilter-schulen-kitas-fakten/
Quelle: Tsinghua University, Beijing (24.04.20) empfiehlt Luftfilter an Schulen