Modified welder's helmet using spillproof impingers.
D000397:Air Pollution / Q000032:analysis*; D002248:Carbon Monoxide / Q000032:analysis; D009585:Nitrogen Dioxide / Q000032:analysis; D009787:Occupational Medicine; D010126:Ozone / Q000032:analysis; D011138:Polytetrafluoroethylene; D011482:Protective Devices; D014896:Welding
D010126:Ozone; D002248:Carbon Monoxide; D011138:Polytetrafluoroethylene; D009585:Nitrogen Dioxide