Safety & Loss Prevention

FOOTNOTES for Table Z-1-A

University of Wisconsin System Administration
29 CFR Ch. XVII (7-1-92 Edition)
Table Z-1-A -- Limits for Air Contaminants
FOOTNOTES to the Table

*The transitional PELs are 8-hour TWAs unless otherwise noted; a (C) designation denotes a ceiling limit.

**Unless otherwise noted, employers in General Industry (i.e., those covered by 29 CFR 1910) may use any combination of controls to achieve these limits until Dec. 31, 1993 as set forth in 29 CFR 1910.1000(f).

***As determined from breathing-zone air samples.

  1. Parts of vapor or gas per million parts of contaminated air by volume at 25 C and 760 torr.
  2. Miligrams of substance per cubic meter of air. When a numerical entry for a substance is in the mg/m3 column, then the number in the mg/m3 column is exact. When numerical entries for a substance are in both the ppm and mg/m3 columns, then the number in the ppm column is exact and the number in the mg/m3 column may be rounded off.
  3. Duration is for 15 minutes, unless otherwise noted.
  4. The final benzene standard in 1910.1028 applies to all occupational exposures to benzene except some subsegments of industry where exposures are consistently under the action level (i.e., distribution and sale of fuels, sealed containers and pipelines, coke production, oil and gas drilling and production, natural gas processing, and the percentage exclusion for liquid mixtures; for the excepted subsegments, the benzene limits in Table 2-2 apply.
  5. Exposures under 10,000 ppm to be cited de minimus.
  6. The CAS number is for information only. Enforcement is based on the substance name. For an entry covering more than one metal compound measured as the metal, the CAS number for the metal is given--not the CAS numbers for the individual compounds.
  7. Compliance with the subtilisins PEL is assessed by sampling with a high volume sampler (600-800 liters per minute) for at least 60 minutes.
  8. The acetone STEL does not apply to the cellulose acetate fiber industry. It is in effect for all other sectors.
  9. The Final Rule Limit of 5 mg/m3 is not in effect as a result of reconsideration. Calcium hydroxide is covered by the exposure limits for particulates not otherwise regulated of 5 mg/m3 respirable dust and 15 mg/m3 total dust.
  10. The Final Rule Limit TWA of 5 mg/m3 is not in effect as a result of reconsideration. The calcium oxide Transitional Limit of 5 mg/m3 remains in effect and employee exposures shall be kept below that level pursuant to the methods of compliance specified in 29 CFR 1910.1000(e).
  11. The Final Rule Limit STEL of 0.1 mg/m3 is not in effect as a result of reconsideration for the industrial sector of civilian manufacture and distribution of explosives and propellants for civilian use. The Final Rule Limits Skin Designation and Transitional Limits Ceiling Limit of 1 mg/m3 remains in effect for this sector until completion of the reconsideration.
  12. The Final Rule Limit STEL of 0.1 mg/m3 is not in effect as a result of reconsideration for the industrial sector of civilian manufacture and distribution of explosives and propellants for civilian use. The Final rule limits skin designation and the transitional limits ceiling limit of 2 mg/m3 remains in effect for this sector until completion of the reconsideration.
  13. Sampling for the carbon monoxide ceiling limit shall be averaged over 5 minutes but an instantaneous reading over 1500 ppm shall not be exceeded.
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