title: Survey of the methodology for evaluating negative air ions: relevance to biological studies.
mesh_terms: D000388:Air / Q000032:analysis*; D000818:Animals; D000838:Anions / Q000009:adverse effects / Q000032:analysis*; D004553:Electric Conductivity; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D006801:Humans; D007753:Laboratories; D011868:Radioisotopes
chemical_list: D000838:Anions; D011868:Radioisotopes