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 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.
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 07:00 - 19 0 evening 19 - 23 5 night 23 - 07:00:00:00:00:00 10 The exact hours of the three periods may be chosen differently by individual EU member states.