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HygieneReady

DSEAR Awareness: syllabus

United Kingdom version. Last updated 31 October 2026.

3 online modules, each with a real-life scenario and a short quiz, then a final test of 12 questions. Pass with 9 correct answers in 20 minutes. Refresher training is recommended every 3 years.

  1. Module 1. Dangerous substances and explosive atmospheres

    Many workplaces use substances that can burn or explode: fuels, solvents, gases and even fine dusts like flour, sugar and wood.

    What you will learn

    • Name common dangerous substances.
    • Explain what an explosive atmosphere is.
    • Describe the legal duties.

    Key points

    • Fuels, solvents, gases and fine dusts can all form explosive atmospheres.
    • Explosions need fuel, air and an ignition source.
    • Settled dust can feed a bigger secondary explosion.

    Based on: Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR); Health and Safety at Work etc. Act 1974; HSE guidance L138.

  2. Module 2. Hazardous zones and ignition sources

    Areas where explosive atmospheres may occur are classified into zones, and ignition sources in them are tightly controlled.

    What you will learn

    • Describe the zone system.
    • Recognise the Ex warning sign.
    • Name and control ignition sources.

    Key points

    • Zones 0, 1, 2 (gas) and 20, 21, 22 (dust) show how likely an explosive atmosphere is.
    • A yellow EX triangle marks hazardous areas.
    • Only Ex-marked equipment suitable for the zone may be used.
    • Control flames, sparks, hot surfaces and static.

    Based on: Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR); Health and Safety at Work etc. Act 1974; HSE guidance L138.

  3. Module 3. Safe working and emergencies

    Safe habits stop dangerous substances becoming fires or explosions.

    What you will learn

    • Store and handle dangerous substances safely.
    • Follow permits and site rules.
    • Respond to leaks and spills.

    Key points

    • Keep small quantities, closed containers and secured cylinders.
    • Follow permits and keep ignition sources out of zones.
    • For leaks: remove ignition sources, do not operate switches, evacuate and raise the alarm.

    Based on: Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR); Health and Safety at Work etc. Act 1974; HSE guidance L138.

HygieneReady certificates confirm completion of training. They are not a regulated qualification. Definitions of the key terms are in the glossary.