If certain environments contain novel coronaviruses, it is recommended that they be disinfected by professional health personnel, unattended, using peracetic acid or hydrogen peroxide disposal, or mobile ultraviolet light. This can generally be done by increasing ventilation and using a qualified air disinfector; it is not the case that the environment is safe after using an air disinfector or disinfecting it with air. Without any protection, being with a patient or infected person still has the potential for infection.