title: Are air ions biologically significant? A review of a controversial subject.
mesh_terms: D000390:Air Ionization; D000818:Animals; D001695:Biology; D002986:Clinical Trials as Topic; D007477:Ions; D051379:Mice; D012141:Respiratory Tract Infections / Q000209:etiology; D012701:Serotonin / Q000502:physiology; D014887:Weather
chemical_list: D007477:Ions; D012701:Serotonin