Which of the following is an employer responsibility under COSHH?

Under the Control of Substances Hazardous to Health (COSHH) regulations, one of the primary responsibilities of an employer is to provide personal protective equipment (PPE) to employees who may be exposed to hazardous substances in the workplace. This responsibility is crucial because PPE serves as a critical barrier between employees and potential health risks posed by harmful substances. By supplying appropriate PPE, employers ensure that they are taking necessary precautions to protect their workforce, which is a legal and ethical obligation.

The other options, while they may be related to workplace management, do not directly pertain to COSHH regulations. Conducting employee performance reviews, organizing social events, and limiting employee breaks are more aligned with general HR practices and workplace culture rather than specific obligations under health and safety legislation. Thus, the focus of COSHH is on safeguarding employee health with respect to hazardous substances, making the provision of personal protective equipment a key employer responsibility in this context.