Abstract: An air disinfection system for the treatment of air containing contaminants, in one or more enclosed spaces. The system has an enclosed space ventilation system with air quality sensors in the enclosed space, ventilation devices for providing ventilation in the enclosed space and a communications interface operatively connectable to an air disinfection apparatus and the one or more contaminant sensor. The system also includes the air disinfection apparatus including a treatment system with an extractor for drawing air in from the enclosed space and a decontamination system which receives the air from the extractor, the decontamination system to remove and/or neutralize the contaminant aerosols in the air, an outlet for expelling treated air from the device and a moveable support to which the treatment system is attached. The air disinfection system has a system controller for controlling the operation of the air disinfection apparatus and the enclosed space ventilation system.