"air is our first         
nutriment & medicine"         
(Hippocrate, 400BC)         
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The air ion concentration


The importance of air ionisation on Air quality an on Human Health is explained in detail in the chapter “Air Ionisation”.


Air ions are molecules that have either gained or lost one electron and are respectively called “ions négatifs” or “ions positifs”.


A Negative Air Ion (NAI) is an oxygen molecule (O2) that has gained one electron in order to form a superoxide ion (O2-). It has been scientifically proven that these NAIs are essential for human health since:
  • they increase the oxygen concentration in our blood,
  • they boosts our vital functions, like our immune & endrocrine system and the particle expelling process in the trachea
High concentrations of NAIs have a bacteriostatic effect. In combination with a micro-concentration of ozone, they have a bactericidal effect.


A Positive Air Ion (PAI) is another molecule (N2, CO2, …) that has lost one electron. If their concentration is significantly higher than this of the NAIS, many vital functions become unbalanced.


Most of the air purification and conditioning processes, due to the presence of mechanical filters, neutralises the concentration of NAIs.


Impact on Human Health


Scientific studies in offices and clean rooms have proven that, if the NAI concentration is lower than 1000 NAI/cm3, the personnel starts developing syndromes as headaches, fatigue, dizziness, respiratory distress and skin rashes, commonly called “Sick Building Syndrome”


In clean rooms, where the air is "ultra-filtrated", NAI concentrations as low as 50 NAIs/cm3 or even less have been measured. (Hawkins, 1978; Gefter, 2001). Dr Hawkins (1978) from the University of Surrey in England , after a 4 years study in offices of an insurance company, concluded that a “healthy indoor air" needs a  temperature around 20°C, an a relative humidity around 50% and an air ion concentration above 1000 ions/cm3 


Impact on the Air Purification or Conditioning Concept



Appropriate Technology


Air enrichment with NAIs

Negative Air Ion Generators


Bacteriostatic effect

Air ions & microconcentration ozone



© 2008 Air Quality Concept