Emergency smoke masks.
D002248:Carbon Monoxide / Q000032:analysis; D004630:Emergencies; D005390:Fires; D006801:Humans; D008397:Masks; D011482:Protective Devices; D012134:Respiratory Protective Devices; D012906:Smoke; D014481:United States; D014489:United States Occupational Safety and Health Administration
D012906:Smoke; D002248:Carbon Monoxide