The **maximum blood alcohol concentration allowed for professional drivers** is **0.30 grams per liter**. This is because professional drivers, like those who have obtained their driving license less than two years ago, have stricter restrictions regarding alcohol consumption.

- For these drivers, the permitted blood alcohol concentration is **0.3 grams of alcohol per liter of blood**. This is lower than the general limit of **0.5 grams per liter** that applies to other drivers and vehicles.

- Additionally, if a professional driver exceeds this limit and reaches more than **0.30 milligrams of alcohol per liter of air**, they will lose **6 points** from their driving license, reflecting the seriousness of the offense.

These measures aim to ensure road safety, as professional drivers often operate large vehicles or transport passengers, which increases the responsibility and risk in the event of an accident.