Low frequency noise, infrasound and vibrations zone
In spatial planning, the authorities designate a noise zone around noise sources, where the noise level exceeds the recommended noise limit. Below is a review of recommended noise limits for low frequency noise, infrasound and vibrations.
The Danish Environmental Protection Agency has published recommendations about low frequency noise and infrasound in Information from the Danish Environmental Protection Agency, no. 9/1997 "Low Frequency Noise, Infrasound, and Vibrations in the Environment" (in Danish). Information is given about recommended limit values and recommended measurement methods are described.
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Low frequency noise level
(A-weighted level: 10-160 Hz)
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Infrasound level
(G-weighted level)
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Rooms for occupation in dwellings, kindergartens, etc.
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Evening/night (6pm-7am)
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20 dB
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85 dB
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Day (7am-6pm)
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25 dB
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85 dB
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Offices, rooms for teaching and similar noise sensitive use
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30 dB
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85 dB
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Other rooms in enterprises
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35 dB
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90 dB
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The limit values for low frequency noise go for the A-weighted level of the noise in the frequency range 10–160 Hz, and the limit values for infrasound apply to the G-weighted infrasound level. Both measured indoors in the most exposed habitation room as an average over 10 minutes, following the specified measurement procedure. The measurement procedure was last adjusted in March 2010: Measurement procedure LFnoise (in Danish)
The recommended limit values for environmental vibration are:
- 75 dB in dwellings in dwelling areas (day, evening, and night), kindergartens, etc. plus dwellings in mixed areas in the evening and night period (6pm-7am)
- 80 dB in dwellings in mixed areas in the day period (7am-6pm) and in offices, rooms for teaching etc.
- 85 dB in enterprises other than offices.
These limit values apply to the maximum level of whole-body combined weighted acceleration, measured and analysed as specified.
Read more about low frequency noise from wind turbines