Cleaner metal--cleaner air.
D000395:Air Pollutants, Occupational; D000397:Air Pollution / Q000517:prevention & control*; D006801:Humans; D009821:Oils; D010150:Paint; D010969:Plastics; D014896:Welding
D000395:Air Pollutants, Occupational; D009821:Oils; D010969:Plastics