title: The reduction of nitrous oxide pollution in relative analgesia.
mesh_terms: D000397:Air Pollution / Q000032:analysis / Q000517:prevention & control*; D000766:Anesthesia, Dental / Q000295:instrumentation; D000769:Anesthesia, Inhalation; D006801:Humans; D009609:Nitrous Oxide / Q000008:administration & dosage* / Q000032:analysis
chemical_list: D009609:Nitrous Oxide