How to notify us over the holiday period.
Notifications  
If someone has been seriously injured, become seriously ill, or died as a result of work – phone us on 0800 030 040 straight away. We have staff available to respond to these 24/7.
If you’re not sure what a notifiable event is, including your obligation to hold a scene, visit What events need to be notified?
Notifications made through our online form won't be monitored between 12pm on Tuesday 24 December 2024 and 8.30am on Monday 6 January 2025.
If you’re not sure if you need to notify us, use our online notification system and we’ll respond to you after 6 January 2025.
Health and safety concerns
If you have a health and safety concern that isn’t urgent, use our online form and we’ll respond to you after 6 January 2025.
Raise a health or safety concern
General enquiries
General enquiries made by phone or email after 12pm on Tuesday 24 December will be responded to from Monday 6 January 2025. This does not apply to notifications made by phone on 0800 030 040.
We wish you a safe and relaxing holiday.
Find a substance
If you are searching for a substance by CAS number, make sure you put the hyphens in the right place.
The workplace exposure standards (WES) and biological exposure indices (BEI) are guidance values – not prescribed exposure standards (PES).
They are intended to be used as risk criteria for health risk assessment and risk management purposes and applied or interpreted only by people with appropriate training and experience, such as those qualified in occupational health practice.
While business must understand and manage the risks of hazardous or toxic substances at work, we do not recommend untrained people use WES or BEI to assess risk.
If you're new to these standards and indices
We suggest you read these pages first. They've got in-depth explanations and information that you'll find useful:
More information
The following pages have more information about WES and BEI, including explanations of notations and a glossary:
Download document
You can search for WES and BEI information for substances using the search box on this page. Or, download the 14th edition of the book, effective from November 2023:
Related information
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