HSR25, Dangerous substances and explosive atmospheres. Dangerous Substances and Explosive Atmospheres Regulations 2002. Approved Code of Practice

HSR25, Dangerous substances and explosive atmospheres. Dangerous Substances and Explosive Atmospheres Regulations 2002. Approved Code of Practice. This publication from the HSE contains the Approved Code of Practice (ACoP) for the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) 2002. DSEAR requires employers to control the risks from fire, explosions and similar events arising from dangerous substances in the workplace. The ACoP provides practical guidance on how to conduct a DSEAR risk assessment, classify hazardous areas where explosive atmospheres may occur, and select appropriate equipment (ATEX). This is critical for industrial safety in sectors such as petrochemicals, manufacturing with flammable solvents, and woodworking, where dust explosions are a risk. This page provides a structured summary, key provisions, and practical guidance on the application of HSR25 DSEAR ACoP to UK fire safety engineering, building design, and Building Safety Act compliance.