Is it possible that the air we breath affects mood? According to the literature on negative air ions, the answer is yes. In the 1980s biometeorology indicated the action of atmospheric conditions on psychological wellbeing describing "serotonin irritation syndrome" and later "climatic heat stress." Empirical findings were followed by controversial evidence about the effects of negative air ions in laboratory and clinical settings. This book provides an up-to-date overview of the biomedical literature in this topic. First, empirical and experimental data are discussed. Methodological issues...