Respirable quartz: Geometric mean exposures by state, OSHA samples, 1979–2003
PEL - permissible exposure limitmg/m3 - milligrams per cubic meterOSHA - Occupational Safety and Health Administration
Note: Before March 1, 1989 and after March 22, 1993, the OSHA PEL is [(10 mg/m3) /(% quartz + 2)] for respirable dust containing at least 1 percent quartz. From March 1, 1989 to March 22, 1993, the OSHA PEL was 0.1 mg/m3 for respirable quartz. See appendices for source description, methods, and agents.
Source: OSHA Integrated Management Information System.
