Time-of-day corrections in measures of aircraft noise exposure

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Abstract
Results of a socio-acoustic study of human reaction to aircraft noise around Australian airports are described. The relative importance of night, evening and daytime operations in determining overall reaction is assessed using a correlation analysis procedure. Night-time weightings used in most existing noise exposure indices including NEF [noise exposure forecast] and DNL [day/night sound level] are apparently too large, although both night and evening weightings should be > 0 dB. The optimal weightings found were .apprx. 3 dB for night-time operations and 9 dB for evening operations. In a practical noise index it may be more reasonable to apply a weighting of .apprx. 6 dB during both night and evening hours.

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