Biological Efficiency of Ionic Air Purifiers:
Bactericidal Effect

The wearable air purifiers have developed secifically to clean the air in the human breathing zone. Their use is expected to be particularly beneficial to confined environments with air recirculation (e.g.' aircraft cabins).

Bacterial Effect of the BioGuard™1000
on Airborne Microorganisms
(RH = 17+-5%, exposure time = approx. 1 min.)

The high electric charges imposed on the viable microorganisms by the ionic air purifier emitted ions can cause microbal stress, thus rducing the microbial viability in the breathing zone (acting as a "germ killer").

In summary, the data shows that a significant percentage of the airborne viable bacteria can be inactivated in non-humid indoor air within one minute by the ionic effect of the BioGuard™1000 unit (53% of hardy S. epidermidis spores, 70% of P. fluorescens bacteria, and 92% of E. coli bacteria). This is the true microbial killing effect (CFU only) as it does not deal with the physical reduction of the concentration. If the physical reduction (particle removal) efficiency of 90% is included (that is easily reached withih one hour, see Part 1 of our Report), the overall reduction of viable microorganisms is much greater so that only a few  percent of the initially viable bacteria may remain airborne.