The **maximum permitted blood alcohol concentration** for drivers who have obtained their driving license less than two years ago is **0.15 milligrams per liter of exhaled air**. This is because novice drivers, like professional drivers and those who operate vehicles with certain special characteristics (such as heavy goods or passenger transport), have stricter restrictions regarding alcohol consumption.

- **Novice drivers**: Those who have had their driving license for less than two years must maintain a lower blood alcohol concentration to ensure road safety.
- **Permitted concentration**: For these drivers, the permitted alcohol concentration is **0.15 milligrams per liter of exhaled air**.
- **Comparison with other drivers**: In contrast, for more experienced drivers, the permitted concentration is **0.25 milligrams per liter of exhaled air**.

It is important to remember that, although these are the legal limits, the only completely safe concentration for driving is **0.0**, meaning not consuming alcohol before driving.