Government regulations--environmental and occupational health.
D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D003300:Copper; D006801:Humans; D007854:Lead; D007878:Legislation as Topic; D008452:Maximum Allowable Concentration; D014481:United States; D014489:United States Occupational Safety and Health Administration
D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D007854:Lead; D003300:Copper