The biological effects of negatively-charged indoor air conditions
Indoor air conditions may have an impact on human health. Among the various factors affecting indoor air conditions, very few published reports deal with negatively-charged particles. In this review, we detail the biological effects of negatively-charged indoor air conditions, particularly on the psycho-neuro-endocrino-immune network. Short-term（2.5 hours） and medium-term（2 weeks）abidance in a room dominated by negatively-charged air particles resulted in activation of natural killer cell activity induced by recurrent transient activation of interleukin 2. These results indicate that negatively-charged indoor air conditions are better for immune status and may improve our daily lives. (Accepted on August 5, 2009)
