Pollution and scavenging.
D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D000766:Anesthesia, Dental / Q000295:instrumentation*; D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D006801:Humans; D009609:Nitrous Oxide; D014691:Ventilation
D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D009609:Nitrous Oxide