some ffp1 protective masks faced which filter at least 80% of aerosols

aerosols air bacteria care contagious corona coronavirus covid covid19 disease distancing doctor ecology epidemic equipment face faced ffp1 ffp2 ffp3 filter flu health healthcare hospital hygiene illness infection laboratory least mask masks medical medicine overlapping pandemic personal pneumonia polluted pollution prevention protect protection protective quarantine respirator respiratory safety sick social some sterile surgical transmission virus which white yourself