Prozone:

Airborne micro-organisms are a common source of respiratory infection and are of particular threat to people with asthma. Some serious infectious diseases can be easily spread by airborne micro-organisms.
In nature air purification is produced by the action of high energy discharges in lightening on oxygen, creating O?? within the atmosphere. The air purification service from Hygiene Systems recreates this natural process.
The purified air produced destroys harmful micro-organisms with which it comes into contact and breaks down malodour causing compounds neutralizing the unpleasant smells they produce. Because the purified air is a gas it penetrates to even the most inaccessible locations.
The process leaves no chemical residue, all ‘unused’ purified air reverts back to oxygen within a short time.