• Part Number:
    1910
  • Part Number Title:
    Occupational Safety and Health Standards
  • Subpart:
    1910 Subpart Z
  • Subpart Title:
    Toxic and Hazardous Substances
  • Standard Number:
  • Title:
    TABLE Z-2
  • GPO Source:
    e-CFR
TABLE Z-2
Substance 8-hour time weighted average Acceptable ceiling concentration Acceptable maximum peak above the acceptable ceiling concentration for an 8-hr shift
Concentration Maximum duration
Benzenea (Z37.40-1969) 10 ppm 25 ppm 50 ppm 10 minutes.
Beryllium and beryllium compounds (Z37.29—1970) d 2 μg/m3 5 μg/m3 25 μg/m3 30 minutes.
Cadmium fumeb (Z37.5-1970) 0.1 mg/m3 0.3 mg/m3    
Cadmium dustb (Z37.5-1970) 0.2 mg/m3 0.6 mg/m3    
Carbon disulfide (Z37.3-1968) 20 ppm 30 ppm 100 ppm 30 minutes.
Carbon tetrachloride (Z37.17-1967) 10 ppm 25 ppm 200 ppm 5 min. in any 4 hrs.
Chromic acid and chromates (Z37.7-1971) (as CrO3)c   1 mg/10m3    
Ethylene dibromide (Z37.31-1970) 20 ppm 30 ppm 50 ppm 5 minutes.
Ethylene dichloride (Z37.21-1969) 50 ppm 100 ppm 200 ppm 5 min. in any 3 hrs.
Fluoride as dust (Z37.28-1969) 2.5 mg/m3      
Formaldehyde; see 1910.1048        
Hydrogen fluoride (Z37.28-1969) 3 ppm      
Hydrogen sulfide (Z37.2-1966)   20 ppm 50 ppm 10 mins. once, only if no other meas. exp. occurs.
Mercury (Z37.8-1971)   1 mg/10m3    
Methyl chloride (Z37.18-1969) 100 ppm 200 ppm 300 ppm 5 mins. in any 3 hrs.
Methylene Chloride: See §1919.52.        
Organo (alkyl) mercury (Z37.30-1969) 0.01 mg/m3 0.04 mg/m3    
Styrene (Z37.15-1969) 100 ppm 200 ppm 600 ppm 5 mins. in any 3 hrs.
Tetrachloroethylene (Z37.22-1967) 100 ppm 200 ppm 300 ppm 5 mins. in any 3 hrs.
Toluene (Z37.12-1967) 200 ppm 300 ppm 500 ppm 10 minutes.
Trichloroethylene (Z37.19-1967) 100 ppm 200 ppm 300 ppm 5 mins. in any 2 hrs.

 

a This standard applies to the industry segments exempt from the 1 ppm 8-hour TWA and 5 ppm STEL of the benzene standard at 1910.1028.

b This standard applies to any operations or sectors for which the Cadmium standard, 1910.1027, is stayed or otherwise not in effect.

c This standard applies to any operations or sectors for which the exposure limit in the Chromium (VI) standard, §1910.1026, is stayed or is otherwise not in effect.

d This standard applies to any operations or sectors for which the exposure limits in the beryllium standard, § 1910.1024, are stayed or is otherwise not in effect.

[62 FR 42018, August 4, 1997] as amended [71 FR 36009, June 23, 2006; 82 FR 2735-2736, Jan. 9, 2017]