Review of statutory Limits in the Netherlands

Noise Nuisance Act
Limits in Lcorrected,24hrs dB(A)
(+..)=temporary correction anticipating less noisy equipment
(-..)=penalty to be substracted
(--)=not specified in the regulations
  Preferred level Maximum allowable if conditions are met
Source New Residential area New Source Both New Both Existing INSIDE
Road traffic (local) 50 (+5) dB(A) 65 (+5) dB(A) 65 (+5) dB(A) 60 (+5) dB(A) 70 (+5) dB(A) 35 dB(A)
Road traffic Motorways) 50 (+3) dB(A) 55 (+3) dB(A) 60 (+3) dB(A) 55 (+3) dB(A) 70 (+3) dB(A) 35 dB(A)
industrial areas 50 dB(A) 55 dB(A) 55 dB(A) 55 dB(A) 65 dB(A) 35 dB(A)
impuls noise 50 dB(A) (-5) 50 dB(A) (-5) 50 dB(A) (-5) 55 dB(A) (-5) 65 dB(A) (-5) 35 dB(A)
railway noise 57 dB(A) 70 dB(A) 70 dB(A) 70 dB(A) existing level
(73 dB(A) when expanding railway) 		35/37 dB(A)
Environmental Protection Act
Small enterprises 50 dB(A) -- -- -- -- -- dB(A)
Aviation Act
Aircraft over 6000 kg (Kosten-units) 35Ku 45Ku 45Ku 45Ku 65Ku 35 à 40 dB(A)
Small aircraft
(below 6000 kg )
(Bkl-units) 		47+ 3 -- -- -- -- --

Definition of Lcorrected, 24hrs

Values are calculated for separate day (7.00-19.00), evening (19.00-23.00) and night (23.00-7.00) levels. To the evening level 5 dB(A) is added, and to the night level 10 dB(A). Lcorrected is then the maximum of:
Lday
Levening + 5 dB(A)
Lnight + 10 dB(A)
This looks like, but is NOT the same, as the standard Ldn procedure with a night penalty of 10 dB(A).

Definition of Kosten-unit

Aircraft noise of large civil and militairy aircraft - based on the Aviation Act- is treated differently. The Kosten-method is derived from the NNI-method, but with a night-penalty of 10. 35 K- units are comparable to 60 à 65 dB(A) Ldn-level, but this depends on the way the airport is operated, and the position relative to the runway.

Definition of Bkl

For small (under 6000 kg) aircraft the noise metric is based on the Lden (day-evening-night equivalent sound level). The level is calculated approximately over the busiest weekend.