The Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) are British regulations that govern the safe handling of hazardous substances in the workplace.
Its purpose is to prevent explosions or fires caused by flammable gases, vapours, dusts or liquids. Employers must recognise and assess hazards, and take appropriate measures to protect employees and equipment.

DSEAR applies to many sectors, including the chemical, industrial and agricultural sectors, wherever highly flammable substances are handled.

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