Abstract: A mobile disinfection unit for use in a method of disinfecting a given facility or equipment such as a room, apparatus, container or vehicle. The unit includes a catalytic converter device for decomposing ozone, a VOC filter for removing bacterial viruses and other contaminants and an electrostatic filter for removing molecules, particles, droplets, smoke and dust. The method includes a treatment step for adding ozone and steam/water droplets into the air of the facility or equipment, a detection step of continuously detecting the ozone concentration in the facility or equipment, and a removal step arranged for removing residual ozone and any contaminates from the facility or equipment when a predefined ozone concentration has been reached and maintained for a specific time interval.