"Permille" and "mg/l" are two different ways of expressing alcohol content.
Permille is a unit of concentration used in Europe and other parts of the world. It indicates the alcohol content in the blood as a fraction of 1000. For example, 0.5‰ means that there is 0.05 grams of alcohol per 1 liter of blood.
When someone takes a breath test, the alcohol tester measures the amount of alcohol in the exhaled alveolar air, i.e. the amount of alcohol in mg per liter of air.
To convert a display in ‰ to a display in mg/l, the factor 2.27 must be used.
A few examples:
0.5‰ = 0.22mg/l
0.8‰ = 0.35mg/l
It is very important not to confuse the two values (‰ and mg/l) and to always state them. We therefore do not understand why press releases sometimes do not mention what display value they are talking about. When measuring the temperature, don't you also say whether it is measured in °Celsius or °Fahrenheit?