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The maximum acceptable concentration for carbon tetrachloride is 0.002 milligrams per litre (rounded). This value is calculated by taking the tolerable daily intake (previously calculated) 0.00071 milligrams per kilogram body weight per day and multiplying it by 70 kilograms and then multiplying by 0.2. This value is then divided by 4.3 litre-equivalents to achieve the maximum acceptable concentration.