Ionic air purifiers derive from a multitude of technologies, all of which contain one or more beneficial reactive agents that claim to clean the air that we breathe. Manufacturers willingly publish test results to demonstrate the potency of these reactive agents against harmful contaminants.
Safety First – Beneficial Reactive Agents
Unfortunately, manufacturers are not as forthcoming with information on the potential harm to human tissue of users who are exposed to the reactive agents. The in-depth article dealing with this aspect is posted at EzineArticles.com.
Safety First Redux – Unintended By-products
Manufacturers are also not forthcoming about the by-products of their technology. Unbeknownst to many users, all ionic air purifier technologies generate by-products apart from the beneficial reactive agents. They are not deliberately produced but are simply unintended products resulting from current technological constraints.
Ozone, a component pollutant of smog, is the most common of these by-products. Smog, which hangs like a foggy cloud over some cities, is typically produced by the reaction of sunlight on automotive emissions such as carbon monoxide. Ozone in smog is blamed for many ills.
Please note that this article is not 改善室內空氣質素 a discussion about ozone generators, a class of air purifiers that deliberately produces ozone in high enough concentrations to eliminate airborne contaminants. For instance, some hotels use ozone generators to get rid of tobacco smoke from rooms when they are being prepared for the next guest.
It is commonly accepted that ozone generators pose a danger to human tissue because ozone is an extremely reactive oxidizing agent. However, for some strange reason, ozone generators are still freely sold to home users as air purifiers. This controversy probably warrants another round of in-depth research in future.
All Ionic Air Purifiers Produce Some Ozone As A By-product
The focus of this article is on ionic air purifiers that do not deliberately produce ozone. There is no dispute that all ionic air purifier technologies are currently unable to completely eliminate ozone in the process of producing their beneficial reactive agents, be they negative ions, bipolar ions or plasmacluster ions and so on. It is a question of how much ozone is produced as an unintended by-product and at which point it becomes unhealthy and harmful to users of the ionic air purifier.
Most manufacturers emphasize that the ozone produced by their technology is very minimal. Often, they claim that it is way below 50 parts per billion (ppb), a measure of ozone concentration commonly cited by various parties around the world. Interestingly, there is no established legislation, only guidelines, regulating that ionic air purifiers cannot produce ozone in excess of 50 ppb. This leads us to the next question.
Is Ozone Concentration At 50 ppb Safe?
This is the million dollar question in the multimillion dollar ionic air purifier industry