To contain the spread of SARS-CoV-2, some designated hospitals have been appointed by the Chinese government as special treatment sites for the patients with COVID-19. Patients in the designated hospital were in high density, the SARS-CoV-2 could be excreted by respiratory droplets or aerosols, contaminating the surrounding environment. It has been reported that SARS-CoV-2 can remain viable and infectious in aerosols for hours and on surfaces up to days.7 If environmental disinfection is not thorough or effective, SARS-CoV-2 may spread widely and can even lead to nosocomial infection.