A quality factor, equal to the ratio of a threshold breakthrough time and pressure drop, is used to compare filters. In general, those with higher carbon surface area per unit volume had higher efficiencies and greater pressure drops. Future work should address the removal of ozone in the presence of other gases. They are also used for control of light, industrial pollutants such as welding smoke, oil and cooling mists. Normally the wires in the ionizing section are operated with a positive corona discharge to limit production of ozone.
Ozone is a powerful oxidant that, when inhaled, reacts with the body s internal tissues.
Long-term exposure may lead to severe respiratory discomfort. There are also restrictions on the amount of ozone in industrial settings as well as on the concentration of ozone outdoors. One benefit of controlling ozone generation rate by selection of wire material is that the electrical characteristics of the air cleaner are not affected. On-going work aims to establish ozone generation rates with plated and alloyed wires. The University of Minnesota indoor solar test facility is used to study component design under carefully controlled conditions.