Environmental Noise Directive - EU
The EU environmental noise exposure metrics Leq24h, LDay, LEvening, LNight, Ldn, and Lden for road, rail and air traffic noise sources. Calculates cumulative exposure (Lden) over a 24-hour period based on day, evening, and night noise levels.
Environmental Noise Directive Exposure Calculator
The EU Environment Noise Directive defines noise exposure indicators:
- Ld - day noise indicator (07:00 - 19:00, 12 hours)
- Le - evening noise indicator (19:00 - 23:00, 4 hours)
- Ln - night noise indicator (23:00 - 07:00, 8 hours)
Cumulative Exposure Formula
Lden = 10 log[(1 / 24) (td × 10^(Ld/10) + te × 10^((Le + 5)/10) + tn × 10^((Ln + 10)/10))]
Where:
- Lden = cumulative exposure (dBA)
- Ld = day exposure (dBA)
- Le = evening exposure (dBA)
- Ln = night exposure (dBA)
- td = day hours
- te = evening hours
- tn = night hours