Fogging is applying chemical disinfectants to an area by way of a fog or mist. A fogging machine is used to produce a fog like mist of tiny droplets of a sanitising solution. Fogging is the ideal solution for fighting airborne pathogens such as bacteria or viruses as well as disinfecting large areas efficiently.

The process is generally carried out for a minimum of 30 minutes per room and an additional 60 minutes per room to allow the droplets to settle out of the air and onto the surfaces.
It is argued that chemical fogging is the most efficient and effective method for decontaminating whole rooms as it enables difficult to reach places to be thoroughly disinfected.