Define 'substance' as per COSHH.

The definition of 'substance' as per the Control of Substances Hazardous to Health (COSHH) regulations encompasses a broad range of materials that can potentially affect health. Specifically, the correct choice highlights that a substance includes any natural or artificial material, particularly chemicals, that may pose health risks. This definition is crucial for identifying hazardous substances in the workplace and ensuring effective risk management and safety measures are applied.

Understanding this is vital for health and safety professionals as it encompasses various materials that could be encountered in a work environment, ensuring that appropriate precautions and controls are implemented to protect workers.

In contrast, options that limit the definition to specific categories, such as products used solely for cleaning, items of personal protective equipment, or raw materials in production, do not align with the comprehensive definition provided by COSHH. These alternatives fail to cover the breadth of substances addressed by the regulation, which is significant for ensuring a safe working environment.