Control of Substances Hazardous to Health Regulations 2002 (COSHH) The law requires employers to control substances that are hazardous to health. You can prevent or reduce workers exposure to hazardous substances by: finding out what the health hazards are; deciding how to prevent harm to health (risk assessment). Introduction Using chemicals or other hazard substances at work can put people's health at risk. Employers must control exposure to hazardous substances to prevent ill health by complying with the Regulations. The Control of Substances Hazardous to Health Regulations 2002. (Approved Code of Practice and Guidance) The sixth edition of this Approved Code of Practice and guidance provides practical advice to help duty-holders comply with the requirements of the COSHH Regulations. https://watmos.simplyhas.com/e-learning/pdfs/l5.pdf The guidance outlines the preferred or recommended methods that can be used to comply with the Regulations and the accompanying guidance also provides advice on achieving compliance, such as the control of carcinogenic substances or those causing occupational asthma, monitoring control measures and conducting health surveillance.