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  • Health & Safety Memo - Health in the workplace - Hazardous substances - Control of major accident hazards - 6104
    Establishments are divided into lower tier and upper tier depending on the quantity of certain substances that are stored or used within them: Substance Lower-tier quantity in tonnes Upper-tier quantity in tonnes Ammonium nitrate1 5000 10000 Ammonium nitrate2 1250 5000 Ammonium nitrate3 350 2500 Ammonium nitrate4 10 50 Potassium nitrate5 5000 10000 Potassium nitrate6 1250 5000 Arsenic pentoxide, arsenic (V) acid and/or salts 1 2 Arsenic trioxide, arsenious (III) acid and/or salts 0.1 Bromine 20 100 Chlorine...
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