Long-Term Exposure Limit
A time period of 8-hours (TWA) which is used for managing workplace exposure limits. These long periods are set to help prevent the effects of substances which “require prolonged or accumulated exposure”. (Source: EH40/2005 Workplace exposure limits, HSE, p.28, https://www.hse.gov.uk/pubns/books/eh40.htm, accessed 10th June 2022)