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Laboratory Evaluation of Annoyance of Low Frequency Noise Introduction. Objective of the ProjectSeveral different assessment methods for the annoyance due to low frequency noise have been proposed during the later years. Also the noise limits or criteria values used with the different assessment methods differ. As a consequence of the ambiguity the Danish Environmental Protection Agency has asked for an investigation, where the subjectively assessed annoyance due to a number of practical examples of low frequency noise was compared with the predicted annoyance using different assessment methods. Such an investigation could indicate the best suitable method for assessment of low frequency noise. It could probably also indicate a need for an adjustment or a revision of the Danish assessment method that was published in Information No. 9/1997 from the Danish Environmental Protection Agency, "Low frequency noise, infrasound and vibration in the environment" [1]. The project reported here was made in cooperation between the Danish Environmental Protection Agency and the Department of Acoustic Technology at The Technical University of Denmark. M. Sc. Frank Rysgaard Mortensen prepared, conducted and analysed the listening tests, and Associate Professor Torben Poulsen was responsible for the quality control and for the major part of the report. Preliminary results from the project was presented at the conference "Low Frequency noise and Vibration" in Aalborg, Denmark, May 2000 [2]. The views that are expressed in this report do not necessarily reflect the attitude of the Danish Environmental Protection Agency. It is found however that the project represents a valuable contribution to the investigation about noise and its effect on people.
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