OSHA issues PEL standard.
D000395:Air Pollutants, Occupational / Q000009:adverse effects*; D015386:Hazardous Substances / Q000009:adverse effects*; D006801:Humans; D008452:Maximum Allowable Concentration; D009784:Occupational Diseases / Q000517:prevention & control*; D014481:United States; D014489:United States Occupational Safety and Health Administration
D000395:Air Pollutants, Occupational; D015386:Hazardous Substances