In the context of the UK, the Control of Substances Hazardous to Health (COSHH) regulations impose several legal requirements on employers to protect their employees from exposure to hazardous substances. Here are some key legal requirements:Risk Assessment: Employers must conduct a risk assessment to identify and evaluate the risks posed by hazardous substances in the workplace. This assessment should include identifying the substances present, assessing the risks of exposure, and implementing control measures to mitigate these risks.Control Measures: Employers must implement control measures to prevent or minimize exposure to hazardous substances. This can include engineering controls (such as ventilation systems), administrative controls (such as safe work practices), and personal protective equipment (PPE).Monitoring and Testing: Employers may be required to monitor and test the levels of hazardous substances in the workplace to ensure that exposure levels are within acceptable limits. This can involve air monitoring, biological monitoring, or surface testing, depending on the nature of the substances involved.Information and Training: Employers must provide employees with information and training on the hazards associated with the substances they work with, as well as the control measures in place to protect them. This includes providing safety data sheets (SDS) for hazardous substances and training employees on safe handling procedures.Health Surveillance: In some cases, employers may be required to provide health surveillance for employees who are exposed to certain hazardous substances. This involves monitoring employees’ health to detect early signs of exposure-related health effects.Review and Revision: Employers must regularly review and, if necessary, revise their COSHH assessments and control measures to ensure they remain effective and up-to-date.