EH40/2005 Workplace Exposure Limits (link)
The Health & Safety Exective (HSE) has published this 2018 edition of guidance containing the list of workplace exposure limits (WELs) for use with the Control of Substances Hazardous to Health Regulations 2002 (COSHH).
This edition replaces the previous version, first published in 2011 and takes account of the new limits for substances listed in Directive 2017/164/EU, the fourth Indicative Occupational Exposure Limit Values (IOELV) Directive. This edition also reintroduces the biological monitoring guidance values in Table 2 for chlorobenzene, isocyanates and 4,4-methylenedianiline which were omitted from the previous edition.
Source: HSE.