Abstract
The assessment of airport noise in communities has been fraught with confusion by the proliferation of metrics. This paper will discuss the origins and uses of unusual acoustic metrics such as Time Above, Community Noise Index (CNI), Noise per Seat Index (NPSI), D-weighting, and exposure (EXP); and compare them with more ordinary ones such as Effective Perceived Noise Level (EPNL), Day–Night Equivalent Sound Exposure Level (DNL), A-weighting, maximum level (Lmax), and signal-to-noise ratio (S/N). The metrics will then be scrutinized from the technical, airport, and community viewpoints, and the strengths and weaknesses of each will be discussed. Nonacoustic factors, such as listener expectations, will also be discussed. It will be seen why so many different types of decibel have led to confusion.
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