Before revision: Definition L is calculated as: Where the long-term average noise levels are defined as: Part of the day hours penalty (dB) day 6 - 18 0 evening 18 - 22 5 night 22 - 6 10 The exact hours of the three periods may be chosen differently by individual EU member states.
After revision: Definition L is calculated as: Where the long-term average noise levels are defined as: Part of the day hours penalty (dB) day 7 - 19 0 evening 19 - 23 5 night 23 - 7 10 The exact hours of the three periods may be chosen differently by individual EU member states.