https://asianverification.com/blog/overview-of-ohsas-18001-certification-the-standard-for-occupation

OHSAS 18001 is a widely recognized standard for Occupational Health and Safety Management Systems (OHSMS) that provides organizations with a framework to manage and improve their health and safety performance. It was revised in 2007 and again in 2018. The latest version of the standard is known as ISO 45001:2018, which replaced OHSAS 18001 in March 2021.