title: Nitrous oxide (N2O) cryosurgical units must be scavenged.
mesh_terms: D016902:Air Pollution, Indoor / Q000517:prevention & control*; D002245:Carbon Dioxide / Q000494:pharmacology; D003452:Cryosurgery / Q000295:instrumentation*; D006801:Humans; D009609:Nitrous Oxide / Q000009:adverse effects*; D016273:Occupational Exposure / Q000517:prevention & control*; D014691:Ventilation / Q000592:standards*
chemical_list: D002245:Carbon Dioxide; D009609:Nitrous Oxide