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Occupational Exposure Limit (OELs) Updates

Occupational Exposure Limit (OELs) Updates

Effective January 1, 2018, Regulation 833 and O. Reg. 490/09 are amended by (O. Reg. 287/17) and (O. Reg. 288/17) to reflect the adoption of new or revised occupational exposure limits (OELs) or listings for 21 chemical substances based on recommendations by the American Conference of Governmental Industrial Hygienists (ACGIH). These changes were included in the Ministry’s 2016 consultation “Proposed Changes Affecting the Control of Hazardous Substances under the Occupational Health and Safety Act.” An overview of these changes is given below:

  • Addition of specific listings for 4 substances in regulation: Cyanogen bromide, Ethyl isocyanate, Peracetic acid and Phenyl isocyanate.
  • Revisions to exposure limits or listings for 17 substances currently regulated: Acetone, Atrazine, Barium sulfate, 1-Bromopropane, Ethylidene norbornene, Lithium hydride, Methomyl, Methyl formate, Methyl isocyanate, Naphthalene, Nickel carbonyl, Oxalic Acid, Pentachlorophenol, Pentane, and Trichloroacetic acid, 1,2,3 – Trichloropropane, and Triethylamine.

In addition to the changes noted above, effective January 1, 2018, the Ministry has moved forward with the adoption of proposals that were the subject of earlier consultations. These changes include the adoption of a more protective OEL for the substance beryllium, the adoption of the ACGIH method for addressing exposures to the aliphatic hydrocarbon gases (C1 – C4), and changing the minimum oxygen content in section 138(1) of Regulation 851 – Industrial Establishments from 18% to 19.5% as set out in (O. Reg. 289/17).

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