Proposed changes to Workplace Exposure Standards and Biological Exposure Indices

We are consulting on proposed changes to Workplace Exposure Standards (WESs) and Biological Exposure Indices (BEIs) for the following substances:

  • Flour dust
  • Hydrogen sulphide
  • Nitrogen dioxide
  • Propylene oxide
  • Styrene
  • BEIs: Arsenic (elemental and soluble inorganic compounds); Benzene; Carbon disulphide; Carbon monoxide; Chromium VI (hexavalent chromium), water-soluble fume; Ethyl benzene; Fluorides; Mercury (elemental); 4,4-Methylene bis(2-chloroaniline) (also known as MOCA, MBOCA); 4-4-Methylene diphenyl diisocyanate (MDI); Methyl isobutyl ketone (MIBK); Pentachlorophenol (PCP); Phenol; Tetrahydrofuran (THF); Toluene diisocyanate-2,4- or 2,6- or mixture of isomers (TDI); Toluene; Trichloroethylene (TCE).

Reviews for each of the proposals (WESs and BEIs) have been carried out by WorkSafe. There are separate proposal documents for each of the proposed WES changes and one proposal document that covers all of the proposed BEI changes:

Biological Exposure Indices (BEI) review (PDF 248 KB)

ACGIH Statement of Position regarding the TLVs and BEIs (PDF 74 KB)

ACGIH policy statement on the uses of TLVs and BEIs (PDF 67 KB)

To provide a submission please use (only use) the submission spreadsheet:

Submissions spreadsheet (XLSX 51 KB)

Please note within the next few weeks we will be consulting on a further group of WES including: beryllium, cobalt, chromium (VI), manganese, nickel, perchloroethylene, Portland cement, synthetic mineral (vitreous) fibres, sulphuric acid, total welding fume.

Where to send your response


Subject line: Consultation on WES and BEIs.

We encourage you to advise interested parties about this process, to help ensure that the consultation process is available to as many individuals and stakeholders as possible.  We would encourage industry associations to share the information with their member organisations, and feedback is welcomed from individuals, businesses and industry associations.

The deadline for response:

The deadline for response is 15th June 2018.

Official Information Act:

We are subject to the Official Information Act 1982, which means that your submission may be made available to those seeking information under that Act.