20 Aug 2018 Exposure to a substance is uptake into the body. Many thousands of substances are used at work but only about 500 substances have Workplace Exposure Limits (WELs) listed in EH40 workplace exposure limits. A guidance sheet, Exposure measurement: Air sampling G409 [3] tells you what

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19 May 2014 As well as controlling exposure to substances hazardous to health, you They are listed in HSE's booklet EH40 Workplace exposure limits. 12 Sep 2018 New workplace exposure limits for 31 substances have been introduced from 21 August 2018. This latest version of EH40 has been updated to workplace exposure limits (WELs) introduced by the 4th Indicative Occupational. Exposure Limit Printed in the United Kingdom for The Stationery Office. help reduce exposure to an acceptable level, as part of your COSHH assessment. 3 The workplace exposure limits (WELs), for H2S are 5 ppm (8-hour time-.