Welcome to the Workplace Exposure Standard (WES) and Biological Exposure Index (BEI) Stakeholder Consultation for 2019

This year WorkSafe New Zealand is proposing changes to the WES of 34 substances and the BEI of one substance.

The substances for which we are proposing changes are as follows:
Acetaldehyde Acrylamide Acrylonitrile
Antimony trioxide 1,3-Butadiene Butyl acrylate
n-Butyl glycidyl ether Carbon disulphide 1,2-Dibromoethane
p-Dichlorobenzene Dichlorvos Dimethyl sulphate
Ethyl chloride Ethylene oxide Epichlorohydrin
Furfural Glutaraldehyde Glycidol
Hydrazine Malathion Maleic anhydride
2-Methoxyethanol 2-Methoxyethylacetate 4,4-Methylene dianiline
Naphthalene Phenyl glycidyl ether Phthalic anhydride
Propylene dichloride Pyridine Silica – crystalline
Sulphur dioxide Thiram Vinyl cyclohexene dioxide
Wood dust    

There are separate proposal documents for each of the substances.

WorkSafe welcomes submissions from all interested parties, including individuals, businesses, industry and professional associations and other groups.   Please feel free to forward this email to other parties that you believe may be interested in making a submission.  If you were sent the email as a representative of an association or other group, WorkSafe encourages you to share the email with your members.


If you wish to make a submission to WorkSafe on the proposed changes, please use the following link to our WES Consultation page and follow the instructions on that page. 

Please note that submissions close at 5:00 pm on 7 August 2019. We will not be accepting submissions in any format other than through the online form.

WorkSafe encourages stakeholders to take special note of the comments on the “WES, PES and BEI explained” section that follows the Privacy statement in the above link.  These comments provide background information about WES, BEI and also prescribed exposure standards (PES), including what they mean and how they should be used.

Further information on WES, including the meaning of WES-TWA and WES-STEL, and BEI is provided in the Glossary sections of each of the proposal documents.

Workplace Exposure Standards and Biological Exposure Indices

The 10th edition of the Workplace Exposure Standards and Biological Exposure Indices publication, published in November 2018, is the most recent edition.  Changes made to WES and BEI following the 2018 WES Consultation process were published in the 10th edition and are highlighted in the Preface, on page 2 of that publication.