Correct answer
0.20 milligrams per litre of exhaled air.
0.20 mg/l exceeds the breath-alcohol maximum of 0.15 mg/l applicable to school transport. The blood-alcohol limit is 0.3 g/l. Do not confuse the units of the two measurements. A reading below a legal limit does not guarantee safe driving: alcohol can impair driving ability.
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0.10 milligrams per litre of exhaled air.
0.20 milligrams per litre of exhaled air.
0.05 milligrams per litre of exhaled air.
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