Foto de stock - 13 January 2021, North Rhine-Westphalia, Duisburg: Christof Asbach, President of the Society for Aerosol Research and Division Manager for Air Pollution Control and Filtration, stands in a hall at the Institute for Energy and Environmental Technology. Asbach has warned against misconceptions about the safety of FFP2 masks. (to dpa ""Aerosol expert: FFP2 masks do not offer 100 percent protection"" from 13.01.2021) Photo: Rolf Vennenbernd/dpa. - Duisburg/North Rhine-Westphalia/Germany

Imagen: 13 January 2021, North Rhine-Westphalia, Duisburg: Christof Asbach, President of the Society for Aerosol Research and Division Manager for Air Pollution Control.

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