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If you are 20 or over, what is the legal alcohol limit in micrograms per litre of breath?
20岁或以上驾驶员的法定呼气酒精上限为每升多少微克？
For drivers aged 20 or over, the legal breath-alcohol limit is 250 micrograms per litre.
20岁或以上驾驶员的呼气酒精法定上限为每升250微克。
阅读相关知识
Drivers under 20 have a zero limit. Drink counts cannot reliably establish legality, and even a small amount can impair driving.
年龄范围包括刚满20岁，未满20岁为零酒精。不能以喝了几杯推算一定合法，少量酒精也可能影响驾驶。